An RV vent cover exists for one promise: the roof vent stays open in the rain. A good one is UV-tough high-density polyethylene on a no-drill, zero-leak mount. A bad one yellows, turns brittle and crumbles into the gutter in two summers — and owners have the photos to prove both outcomes. This guide compares the five vent covers with verified Amazon listings right now — the MAXXAIR Original, Fanmate, Maxx I+ and Maxx II, plus the Dometic Ultra Breeze — on the complaints owners actually file: UV life, hail and ice damage, airflow in rain, and whether the vent lid opens fully underneath. It lives in our vent covers archive under RV and camper accessories.
Short version: most owners should buy the MAXXAIR Original 00-933066 — the only cover here with a published 6-year limited warranty and 12-year owner survival reports. High-powered-fan owners should buy the Fanmate, Fan-Tastic Fan owners the Dometic Ultra Breeze, airflow maximizers the Maxx II, and design-first buyers the Maxx I+. We publish no prices and no test results here: every figure below comes from a maker document or a linked owner report. Readers doing the roof work themselves may also want our Haloview backup camera review — same ladder, same sealant, same roof.
How we researched this guide
We compared 5 RV roof vent covers in depth — four MAXXAIR covers (Original, Fanmate, Maxx I+, Maxx II) and the Dometic Ultra Breeze — against Maxxair’s own product sheets, the Maxxair FAQ, Dometic’s RV product catalog, Maxxair instruction sheets, and their verified Amazon listings (ASINs B000UUMM6K, B010D1VJSC, B0CL5BZTC1, B08VBX6PVK and B082FYMZ9D). Four products we wanted to include — the Camco 40431, the Camco Aero-Flo line, Heng’s and RecPro — appear only where a source is cited, because no Amazon ASIN could be directly verified for them in this pass; an unverified product gets no button here. This review sits in our info guides.
We read 10 owner threads and buying guides — iRV2, Forest River Forums, Airstream Forums and Thor Forums plus BestReviews and rvpioneers — and we printed the complaints as found: UV crumbling, hail and ice breakage, lid-travel fitment conflicts, black-cover light block, and the high-powered-fan airflow restriction that Maxxair’s own FAQ admits. We do not test vent covers, and there are no prices anywhere in this review.
The 30-second answer
Buy the MAXXAIR Original 00-933066 if you want the proven benchmark: 6-year limited warranty, zero-leak no-drill mount, and owner reports of covers still excellent at 5 and 12 years. Buy the MAXXAIR Fanmate 00-955002 if you run a high-powered ventilator fan — Maxxair’s own FAQ names it the rain cover for powered fans. Buy the MAXXAIR Maxx I+ 00-933051 if you want the sleeker aerodynamic redesign of the Original. Buy the MAXXAIR Maxx II 00-933081 if you want the most vent area per the maker and the only cover that hinges open for cleaning. Buy the Dometic Ultra Breeze U1400WHS if you own a Fan-Tastic Fan and need the lid to open fully — owners report it is the only cover that lets it.
Best Overall — The Proven Benchmark
MAXXAIR Original Vent Cover, White (00-933066)
The cover the owner record backs: high-density polyethylene with UV protection, a zero-leak no-drill mount, a published 6-year limited warranty, and iRV2 owners reporting covers still in excellent condition at 5 and 12 years.
Best for High-Powered Fans
MAXXAIR Fanmate Vent Cover, Black (00-955002)
Maxxair’s own FAQ recommends the Fanmate over powered ventilator fans like the MaxxFan and Fantastic Fan: taller body, constant airflow, EZ Clip hardware, and owners who run it open in rain with no water intrusion.
Best Updated Design
MAXXAIR Maxx I+ Vent Cover, White (00-933051)
The redesigned Original: a sleeker aerodynamic shape with maximum UV protection and the same zero-leak protection, in a 20×18×9-inch, 3.2 lb package for non-powered and low-powered vents.
Best Airflow / Easiest to Clean
MAXXAIR Maxx II Vent Cover, White (00-933081)
Twice the Original’s vent area per the maker via exclusive side louvers, a 6-year limited warranty, and the only Maxxair cover with hinged brackets — it opens so you can clean and inspect.
Best for Fan-Tastic Fan Owners
Dometic Ultra Breeze Vent Cover, White (U1400WHS)
The patented airfoil cover that retains up to 95% airflow per Dometic, installs without drilling — and, per Airstream owner reports, is the only cover that lets a Fan-Tastic Fan door open completely.
Quick compare — the five covers on the maker-stated facts that decide the purchase. Warranty terms are exactly what the sources publish: “Not published” means the listing and the maker documents we checked give no warranty, not that none exists.
| Cover | Best for | Fitment | Warranty | Check Price |
|---|---|---|---|---|
| MAXXAIR Original 00-933066 | Proven benchmark | Standard 14×14 in vents | 6-year limited | Check Price |
| MAXXAIR Fanmate 00-955002 | High-powered fans | Powered ventilator fans | Not published | Check Price |
| MAXXAIR Maxx I+ 00-933051 | Updated design | Non-powered / low-powered vents | Not published | Check Price |
| MAXXAIR Maxx II 00-933081 | Airflow + cleaning | Standard 14×14 in vents | 6-year limited | Check Price |
| Dometic Ultra Breeze U1400WHS | Fan-Tastic Fan lids | All 14×14 in roof vents | Not published | Check Price |
Vent-fit finder: which cover matches your vent?
Answer three questions and we will route you to the cover in this review that fits your setup. Every answer routes to one of this article’s five picks with its button. This finder follows the same sizing logic as our winch sizing guide: match the tool to the job, never undersize the choice.
How to choose a vent cover: 6 buyer criteria
UV rating and plastic grade
UV resistance is the number-one longevity differentiator in the owner record. iRV2 owners report MaxxAir covers still in excellent condition after 5 and 12 years, while a competing Camco set was sun-destroyed and crumbled within 2 years. Look for high-density polyethylene with explicit UV protection — that is the material every pick here uses. Dark colors hide yellowing but age the same. We publish UV-life guidance for other RV materials too; see our UV care guide and UV lifespan guide for the same chemistry at work.
Hail and impact resistance
Polyethylene covers can crack under hail, ice storms and fallen branches, and owners have documented all three: Forest River Forums members describe hail shattering vent covers and a tree branch breaking one, letting rain into the toilet vent, while a Thor Forums owner lost a white Maxxair cover to an ice storm. One owner switched to a metal lid specifically because it cannot crack from hail. Factor your roof exposure and storage conditions; no plastic cover in this review is hail-proof.
Airflow in rain vs fan power
Vent-left-open-in-rain is the core promise, so compare the vent-area claims: Maxxair says the Maxx II has twice the Original’s vent area via side louvers, Dometic says the Ultra Breeze retains up to 95% airflow with its airfoil design, and the Fanmate is built for constant airflow over powered fans. But covers always restrict powered-fan airflow somewhat — Maxxair’s own FAQ says so. A powered fan also draws 12V current, so check your battery budget before chasing airflow; our {INT(“/best-winch-battery/”, “12V battery guide”)} and {INT(“/do-winches-drain-battery/”, “battery drain explainer”)} cover the same math.
Fitment: the lid must open fully
The most common real complaint is not leaks — it is clearance. Airstream Forums owners report the Ultra Breeze is the only cover that lets a Fan-Tastic Fan door open completely, while the MaxxAir cover does not; an iRV2 owner found a MaxxAir II over a bathroom vent did not let the lid fully open either. Measure your vent opening (standard is 14×14 inches) and, if you have a powered fan, measure the lid’s travel. BestReviews’ standing advice applies here too: measure before buying.
No-drill installation
Zero-leak no-drill systems — used by the Original, Maxx I+ and Maxx II — are the easiest installs: no new holes in the roof, which matters for roof warranties. Note the exception: the Maxx II’s hinged brackets need 3/16-inch holes in the vent frame itself (not the roof). And leave the 1/2 to 1-inch gap under the cover uncaulked: Maxxair’s FAQ says that gap is how condensation and wind-blown rain escape, and caulking it shut causes the very leaks you bought the cover to prevent.
Color: white, smoke or black
White reflects heat and diffuses daylight into the coach — the default most owners keep. Smoke admits good interior light while cutting glare; Airstream owners specifically praise the smoke Ultra Breeze for interior light. Black absorbs heat and blocks light, and one iRV2 owner regrets buying black for aesthetics, saying it blocked far too much light and they would choose white or smoke next time. In hot climates, color is a thermal decision, not a styling one.
Vent covers by budget
We publish no prices, so treat these as value tiers, not price bands. The same value logic drives our other buying guides; for how posted prices age and why we never quote them, see our cost research guide.
| Tier | What you get | Example pick |
|---|---|---|
| Standard value | The proven HDPE cover: zero-leak mount, published 6-year warranty, decade-plus owner reports. | MAXXAIR Original 00-933066 |
| Newest design | The aerodynamic redesign of the benchmark with maximum UV protection and zero-leak install. | MAXXAIR Maxx I+ 00-933051 |
| Premium airflow | The most vent area per the maker, plus hinged brackets that open for cleaning and inspection. | MAXXAIR Maxx II 00-933081 |
| Powered-fan specialist | The tall rain cover Maxxair’s FAQ recommends for high-powered ventilator fans. | MAXXAIR Fanmate 00-955002 |
| Specialist fit | The airfoil cover that clears a Fan-Tastic Fan lid where Maxxair covers do not. | Dometic Ultra Breeze U1400WHS |
If value is the whole point of the purchase, our budget buying guide and value picks guide judge value the same way: verified specs first, owner record second, price last — and never a figure we cannot source.
Vent cover types compared
The five picks split into four design families. Match the family to your vent before you match the brand.
| Type | Pros | Cons | Best for |
|---|---|---|---|
| Standard low-profile covers (Original, Maxx I+) | Proven zero-leak no-drill mount; compact roof footprint; 6-year warranty on the Original | Restrict high-powered fan airflow (Maxxair FAQ); won’t fit all fan assemblies | Standard non-powered 14×14 vents |
| Tall powered-fan covers (Fanmate) | Recommended by Maxxair for powered fans; constant airflow; no water intrusion reports with vent open in rain | Tall and heavy; overkill for standard vents; bug screens sold separately | High-powered ventilator fans |
| Louvered high-airflow covers (Maxx II) | Twice the Original’s vent area per maker; hinges open for cleaning; 6-year warranty | Larger footprint; needs 3/16-in holes in the vent frame; lid-travel fitment reports | Owners who want maximum airflow and easy cleaning |
| Airfoil universal covers (Ultra Breeze) | Up to 95% airflow retained per Dometic; lets Fan-Tastic Fan lids open fully; no drilling | Brittleness reports after sun exposure; bug screen not included; harder to clean | Fan-Tastic Fan owners |
Detailed reviews: 5 vent covers, judged on complaints first
Every block below follows the same evidence order: why it earned its award, the maker-stated specs, who it fits, the pros against the watch-outs, what owners report with links, who should skip it, and what to pair it with. Unpublished specs are omitted, never guessed.
Best overall: MAXXAIR Original Vent Cover, White (00-933066)
Best Overall — The Proven Benchmark
Why the MAXXAIR Original is our pick
The Original is the cover the owner record actually supports. Maxxair publishes a 6-year limited warranty on it — the only cover in this review with a published warranty term alongside the Maxx II — and iRV2 owners report MaxxAir covers still in excellent condition after 5 and 12 years, against a competing Camco set that the sun destroyed and crumbled within 2 years. A side-by-side comparison on rvpioneers found thicker materials at the common stress points than the Camco standard. The zero-leak mounting system drills no holes in the roof, which is the install most roof warranties prefer.
MAXXAIR Original key specs
- Part number: 00-933066 (white; smoke 00-933067 and black 00-933069 are the sibling colors)
- Fitment: standard 14-inch x 14-inch roof vents and small bathroom fans
- Dimensions: 19.5 in L x 18.5 in W x 9 in H
- Material: one-piece high-density polyethylene, UV-protected
- Mounting: zero-leak system — no holes drilled in the roof
- Warranty: 6-year limited warranty (repair or replacement)
- Rain use: vent can stay open in rain under the cover
- Colors: white (this pick), smoke, black
- ASIN: B000UUMM6K
- Not for: high-powered ventilator fans — the Standard-style cover restricts their airflow per Maxxair’s FAQ
MAXXAIR Original: fits and best for
Fits standard 14×14-inch roof vent openings, including small bathroom fans. Best for the owner who wants the longest proven record in this review: a cover that has survived more than a decade in the owner threads, mounts without drilling, and carries written warranty terms. If your vent is non-powered and your roof has seen more than one hail season, this is the default answer.
MAXXAIR Original: pros and watch-outs
Pros
- 6-year limited warranty — published, not implied
- Zero-leak no-drill mount protects the roof and the warranty
- Owner record of 5 and 12 years in excellent condition vs rivals crumbling in 2
- Thicker materials at stress points than the Camco standard in side-by-side comparison
- Fits standard 14×14 vents and small bathroom fans
Watch-outs
- Won’t accommodate all fan assemblies — BestReviews: measure before buying
- Maxxair’s own FAQ says Standard-style covers restrict high-powered fan airflow — powered fans want the Fanmate below
- Airstream owners report MaxxAir covers do not let a Fan-Tastic Fan door open completely — the Ultra Breeze is the fix
MAXXAIR Original: what owners report
On longevity, the iRV2 thread on covering roof fan vents is the strongest evidence in this review: owners report MaxxAir covers still in excellent condition after 5 and 12 years, while a competing Camco set on the same roofs was sun-destroyed and crumbled within 2 years. That 12-year report is the longest-lived cover testimony we found anywhere in this pass.
On build quality, rvpioneers’ side-by-side comparison found thicker materials at the common stress points than the Camco standard cover — the stress points being exactly where sun and wind fatigue kill cheap covers first. Thicker plastic at the mounting corners is not glamorous, but it is where covers fail.
On the honest caveat, BestReviews’ buying guide notes the Original-style covers will not accommodate all fan assemblies and advises measuring before buying. We print that warning above the button on purpose: a cover that does not clear your fan is a return, not a review.
MAXXAIR Original: who should not buy
Skip it if you run a high-powered ventilator fan — the Fanmate below is Maxxair’s own recommendation for powered fans, with less airflow restriction. Skip it too if you own a Fan-Tastic Fan and need the lid to open fully: Airstream owners report the MaxxAir cover blocks full lid travel, and the Ultra Breeze below is the reported fix. Both alternatives are in this review, with their own buttons.
MAXXAIR Original: pair it with
Pair it with the Dicor 501LSW-1 self-leveling lap sealant for the vent flange and screw heads around the install — the cover is no-drill, but the flange underneath still wants sealed seams on a horizontal roof:
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We may earn a commission at no cost to you.
Tip: inspect the flange sealant every spring when you wash the roof — our Haloview backup camera review covers the same roof-work routine for a different roof device.
Best for high-powered fans: MAXXAIR Fanmate Vent Cover, Black (00-955002)
Best for High-Powered Fans
Why the MAXXAIR Fanmate is our pick
This is the only cover in this review that the maker points at powered fans by name. Maxxair’s own FAQ says the Standard vent cover was designed for standard roof vents and small bathroom fans and will restrict the airflow of a high-powered ventilator fan — and names the Fanmate as the recommended rain cover for high-powered fans, with the Maxx II only as the acceptable alternative when roof space is limited. Forest River Forums owners report dealers recommending the Fanmate over powered fans, and one owner ran a Fanmate over a Create-A-Breeze fan with the vent left open in rain all the time and no water intrusion. If the fan under the cover has a motor and a speed dial, this is the pick.
MAXXAIR Fanmate key specs
- Part number: 00-955002 (black; white 00-955001 is the sibling color)
- Fitment: rain cover designed for high-powered ceiling and ventilator fans (MaxxFan, Fantastic Fan)
- Dimensions: about 25 in L x 18-1/8 in W x 10-1/4 in H
- Material: high-density polyethylene, UV-protected
- Hardware: EZ Clip installation hardware
- Airflow: designed for constant airflow over powered fans
- Rain use: vent stays open in rain; owner reports no water intrusion
- Colors: black (this pick); white sibling exists
- ASIN: B010D1VJSC
MAXXAIR Fanmate: fits and best for
Fits high-powered ventilator fans mounted on standard 14×14-inch openings — MaxxFan, powered Fantastic Fan, Create-A-Breeze and similar. Best for the owner whose fan actually moves serious air: the taller body and constant-airflow design exist because Standard-style covers choke powered fans. Confirm roof clearance before ordering — at roughly 25 inches long and 10-1/4 inches tall it is the biggest cover in this review.
MAXXAIR Fanmate: pros and watch-outs
Pros
- Maxxair’s own FAQ recommends it for high-powered fans — the maker’s word, not ours
- Constant-airflow design with less restriction than Standard/II covers on powered fans
- Owner ran it open in rain over a powered fan with no water intrusion (Forest River Forums)
- Dealer-recommended over powered fans in owner reports
- UV-protected HDPE with EZ Clip installation hardware
Watch-outs
- Tall and heavy — rvpioneers calls it overkill unless you actually have a powered fan
- Bug screens sold separately
- Black absorbs heat and blocks interior light — an iRV2 owner regrets black for aesthetics and would choose white or smoke next time
- Warranty not published on the listing or the maker documents we checked
MAXXAIR Fanmate: what owners report
On the maker’s own position, the Maxxair FAQ is unusually direct: the Standard vent cover will restrict the airflow of a high-powered ventilator fan, the Fanmate is the recommended rain cover, and the Maxx II is only the acceptable alternative when roof space is limited. When the maker tells you which of its own products to buy for a powered fan, that ends the debate.
On real-world rain performance, Forest River Forums owners report dealer recommendations of the Fanmate over powered fans, and one owner ran a Fanmate over a Create-A-Breeze fan with the vent left open in rain all the time and no water intrusion — exactly the promise the product exists to keep.
On the honest caveat, rvpioneers notes the Fanmate is tall and heavy — overkill unless needed for a fan — and that bug screens are sold separately. Buy the capability you have the fan for; do not buy a tall cover for a bathroom vent.
MAXXAIR Fanmate: who should not buy
Skip it if your vent is non-powered — the Fanmate is tall, heavy overkill for a bathroom vent, and the Original or Maxx I+ fit better there. Skip it too if you want maximum interior light: this pick is black, and a black cover blocks far too much light per owner reports. The white Fanmate (00-955001) exists but we could not verify its listing this pass, so the verified fallback for light-sensitive buyers is the white Maxx II below, with its own button.
MAXXAIR Fanmate: pair it with
Pair it with the fan it was made to cover: the MAXXAIR MaxxFan Deluxe 00-05100K — 10-speed reversible fan, thermostat, up to 900 CFM per the maker, fitting a standard 14×14-inch opening. Note that the MaxxFan Deluxe has a built-in rain shield and runs in ceiling-fan mode with the lid closed, so frame this as upgrading the fan itself, not as a cover necessity:
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We may earn a commission at no cost to you.
Tip: a powered fan is a 12V load like any other — check the draw against your battery plan in our 12V battery guide before running it all night.
Best updated design: MAXXAIR Maxx I+ Vent Cover, White (00-933051)
Best Updated Design
Why the MAXXAIR Maxx I+ is our pick
The Maxx I+ is the redesigned Original: a sleeker, more aerodynamic shape that keeps the zero-leak mounting the line is known for. The listing claims maximum UV protection on the high-density polyethylene shell, and at 20×18×9 inches and 3.2 lb it is slightly more compact than the Original while serving the same job — non-powered and low-powered roof vents. It earns the design award honestly: same proven install philosophy, newer aerodynamics, no invented advantages. The owner record is thinner than the Original’s because the design is newer — we say so plainly below instead of borrowing the Original’s testimonials.
MAXXAIR Maxx I+ key specs
- Part number: 00-933051
- Fitment: non-powered and low-powered roof vents; compatible with many popular roof vents
- Dimensions: 20 in x 18 in x 9 in
- Weight: 3.2 lb
- Material: high-density polyethylene with maximum UV protection
- Design: sleek, aerodynamic redesign of the Original
- Mounting: zero-leak protection, no-drill install
- Colors: white
- ASIN: B0CL5BZTC1
MAXXAIR Maxx I+: fits and best for
Fits non-powered and low-powered roof vents on standard 14×14-inch openings, and per the listing is compatible with many popular roof vents. Best for the owner who wants the newest take on the proven formula: the aerodynamic shape matters if the cover will sit in highway wind for thousands of miles a year, and the compact footprint helps on crowded roofs. Not the pick for powered fans.
MAXXAIR Maxx I+: pros and watch-outs
Pros
- Sleek aerodynamic redesign of the proven Original
- Maximum UV protection claimed on the HDPE shell
- Zero-leak no-drill install like the rest of the line
- Compact 20×18×9-inch, 3.2 lb package
- Fits non-powered and low-powered vents, many popular roof vents
Watch-outs
- Thin owner record — the design is newer, so this section leans on the listing and the Original’s lineage, not borrowed testimonials
- Same measure-first fitment caution as all Original-style covers (BestReviews)
- Not the pick for high-powered ventilator fans — that is the Fanmate’s job per Maxxair’s FAQ
- Warranty not published on the listing or the maker documents we checked
MAXXAIR Maxx I+: what owners report
Owner coverage for the I+ is thin — it is the newest design in this review, and we found no substantial forum install record for it in this pass, so we will not invent one. The listing’s own customer summary describes good quality, easy installation and help with heat, but we treat listing summaries as the thinnest evidence tier in this guide.
What we can lean on is lineage: the I+ is the redesigned Original, and the Original’s record is the deepest here — iRV2 owners reporting 5 and 12 years in excellent condition, and rvpioneers finding thicker materials at the stress points than the Camco standard. Buy the I+ for the design; buy the Original if you want the paper trail.
MAXXAIR Maxx I+: who should not buy
Skip it if a written warranty term matters to you — the Original and Maxx II publish 6-year limited warranties and this one does not. Skip it too if you run a powered fan: the Fanmate is Maxxair’s named pick for powered ventilator fans. The I+ is a standard-vent cover wearing a new shape; buy it for that job.
MAXXAIR Maxx I+: pair it with
Pair it with the LATCH.IT 2-pack RV vent insulator — a 14×14-inch press-fit insulator with a reflective surface that drops into the vent from inside. The cover keeps rain out while the vent stays open; the insulator keeps conditioned air in when the vent is closed. Climate control is a two-piece job:
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We may earn a commission at no cost to you.
Tip: covers and winch covers share the same enemy — sun. Our cover buying guide judges UV claims the same way this review does.
Best airflow and easiest to clean: MAXXAIR Maxx II Vent Cover, White (00-933081)
Best Airflow / Easiest to Clean
Why the MAXXAIR Maxx II is our pick
Two facts separate the Maxx II from the rest of the line. First, the maker says it has twice the vent area of the Original via exclusive side louvers for cross ventilation — the strongest airflow claim in this review. Second, it is the only Maxxair cover with hinged brackets: the cover opens so you can clean and inspect underneath, which matters because dirt and debris are exactly what restrict a cover’s airflow over the years. Add the published 6-year limited warranty and a part number we verified against the current live listing (00-933081, not the superseded 00-933072), and this is the airflow maximizer’s pick with the paperwork to match.
MAXXAIR Maxx II key specs
- Part number: 00-933081 (white; verified on the current live listing; supersedes 00-933072)
- Fitment: most standard 14-inch x 14-inch RV roof vents; acceptable high-powered-fan fallback where roof space is tight, per Maxxair’s FAQ
- Dimensions: 22.08 in L x 18.15 in W x 9.72 in H
- Weight: 3.43 lb
- Material: one-piece high-density polyethylene, UV protected
- Vent area: twice the Original’s per the maker, via exclusive side louvers for cross ventilation
- Cleaning: hinged brackets — the only Maxxair cover that opens for cleaning and inspection
- Bug screen: removable screen behind the louvers
- Mounting: hinged brackets need 3/16-inch holes in the vent frame (not the roof)
- Warranty: 6-year limited warranty (repair or replacement)
- ASIN: B08VBX6PVK
MAXXAIR Maxx II: fits and best for
Fits most standard 14×14-inch RV roof vents, and per Maxxair’s FAQ is the acceptable rain-cover alternative for high-powered fans when roof space is too tight for a Fanmate. Best for the owner who wants the most airflow the line offers and who will actually open the hinged brackets once a year to clean out leaves and grit. Measure roof space first — at 22.08×18.15 inches it has the largest footprint of the Maxxair picks.
MAXXAIR Maxx II: pros and watch-outs
Pros
- Twice the Original’s vent area per the maker via side louvers
- Only Maxxair cover with hinged brackets — opens for cleaning and inspection
- 6-year limited warranty, published
- Acceptable high-powered-fan fallback when roof space is tight (Maxxair FAQ)
- Removable bug screen behind the louvers
Watch-outs
- Lid-travel fitment: an iRV2 owner found a MaxxAir II over a bathroom vent did not let the lid fully open — measure lid travel, not just the opening
- Ice-storm breakage: a Thor Forums owner lost a white Maxxair cover to an ice storm
- Hinged brackets need 3/16-inch holes in the vent frame (not the roof, but still holes)
- Part-number confusion: 00-933073 is the smoke Maxx II and 00-933072 is superseded — white is 00-933081 on the current listing
MAXXAIR Maxx II: what owners report
On real installs, an iRV2 MaxxAir II thread owner used a MaxxAir II on a trailer — and a separate complaint in the same thread is the one to heed: a MaxxAir II over a bathroom vent did not allow the vent lid to fully open. The Maxx II’s larger body is its strength for airflow and its risk for clearance; the vent opening and the lid travel are two different measurements.
On impact damage, a Thor Forums owner reports a white Maxxair rain cover broken in an ice storm and awaiting replacement. Polyethylene is UV-tough; it is not ice-proof. If your storage is under trees or in hail country, budget for the possibility of replacement.
On the maker’s own ranking, the Maxxair FAQ puts the Maxx II second for powered fans: Fanmate first, Maxx II only when roof space is limited. Do not buy the Maxx II for a powered fan if a Fanmate will fit — that is the maker telling you its own product is the compromise choice.
MAXXAIR Maxx II: who should not buy
Skip it if roof space is tight — the Maxx II has the largest footprint of the Maxxair picks, and the Original fits smaller clearances. Skip it too if you will not measure lid travel: the iRV2 lid-clearance complaint is the exact failure this cover’s size invites. For a powered fan with room to spare, the Fanmate is the maker’s first choice, not this one.
MAXXAIR Maxx II: pair it with
Pair it with the Dicor BT-1834-1 butyl seal tape for bedding the vent flange — moldable, never hardens, and the right seal under any vent that will see a decade of sun. The hinged brackets make the cover easy to clean; the butyl tape makes the flange easy to trust:
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We may earn a commission at no cost to you.
Tip: put the cover on your seasonal maintenance list next to the roof inspection — our maintenance checklist covers the same twice-a-year rhythm for different gear.
Best for Fan-Tastic Fan owners: Dometic Ultra Breeze Vent Cover, White (U1400WHS)
Best for Fan-Tastic Fan Owners
Why the Dometic Ultra Breeze is our pick
The Ultra Breeze earns its award on a single, owner-documented fact: Airstream Forums owners report it is the only cover that lets a Fan-Tastic Fan’s door open completely — the MaxxAir cover does not. Around that fitment win sits a real design: a patented airfoil shape that Dometic says retains up to 95% airflow, a 10-1/4×19-1/2×23-inch body, and installation with no drilling and all hardware included. We print the brittleness complaints just as prominently below, because the owner record on sun life is the weakest of any pick here — fitment is why you buy it, and sun care is what you owe it.
Dometic Ultra Breeze key specs
- Part number: U1400WHS (white; older numbers U1500WH white, U1500BL black, U1500GR gray)
- Fitment: all types of roof vents; standard 14-inch x 14-inch openings
- Dimensions: 10-1/4 in H x 19-1/2 in W x 23 in L
- Design: patented airfoil design
- Airflow: retains up to 95% airflow per Dometic
- Install: installs without drilling; all hardware included
- Colors: white (this pick; black U1400BLS is the sibling)
- Bug screen: not included
- Fitment note: lets a Fan-Tastic Fan door open completely where Maxxair covers do not, per owner reports
- ASIN: B082FYMZ9D
Dometic Ultra Breeze: fits and best for
Fits all types of roof vents on standard 14×14-inch openings, with the standout use case being Fan-Tastic Fan owners who need full lid travel. Best for the owner who has already fought a Maxxair cover over a Fantastic dome and lost — this is the cover the Airstream threads recommend for exactly that fight. At 23 inches long it is also the longest cover here, so verify roof clearance.
Dometic Ultra Breeze: pros and watch-outs
Pros
- Only cover reported to let a Fan-Tastic Fan door open completely (Airstream Forums)
- Up to 95% airflow retained per Dometic — the highest stated airflow retention here
- Installs without drilling; all hardware included
- 4 years of use with no storm or wind issues in owner reports (Airstream Forums)
- Smoke sibling admits good interior light
Watch-outs
- Brittleness: rvpioneers reports users finding it became brittle and broke after normal sun exposure
- Dirt can restrict airflow and it is harder to clean than the hinged Maxx II
- Bug screen not included — budget for one separately
- Warranty not published on the sources we checked
Dometic Ultra Breeze: what owners report
On the deciding fitment question, Airstream Forums owners report the Ultra Breeze is the only cover that lets the Fan-Tastic Fan’s door open completely — the MaxxAir cover does not. For Fantastic Fan owners, that sentence is the whole review: nothing else in this article clears that lid.
On durability in weather, Airstream Forums owners report 4 years of use with no storm or wind issues, and note the smoke color gives good interior light. Four quiet years in wind and storms is real evidence — it just sits next to the next paragraph.
On the complaint that decides whether you buy it, rvpioneers reports many users finding the Ultra Breeze became brittle and broke after normal exposure to the elements, with dirt restricting airflow and no bug screen included. The owner record splits: great fitment and weather record, weak sun record. Sun-belt owners should weigh that split honestly.
Dometic Ultra Breeze: who should not buy
Skip it if your roof bakes in year-round desert sun — the brittleness reports are the realest complaint against this cover, and the Maxxair Original’s 12-year owner record is the safer sun bet. Skip it too if you want a published warranty term: the Original and Maxx II print 6-year limited warranties and this one publishes none. It is a specialist fitment pick, not the default.
Dometic Ultra Breeze: pair it with
Pair it with the Dicor 501LSW-1 self-leveling lap sealant for the flange and fasteners — the Ultra Breeze installs without drilling, but the vent flange underneath still needs sealed seams on a horizontal roof, and Dicor 501LSW-1 is compatible with EPDM and TPO roofing:
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Tip: a Fan-Tastic Fan is a 12V load — our battery drain explainer walks through the same amp-hour math your fan needs.
Spec comparison
The full maker-stated spec sheet for all five covers, split into two tables so every column fits the page. “Not published” means the listing and the maker documents we checked give no figure — we never guess a spec.
| Feature | Original 00-933066 | Fanmate 00-955002 | Maxx I+ 00-933051 |
|---|---|---|---|
| Fitment | Standard 14×14 in vents | High-powered ventilator fans | Non-powered / low-powered vents |
| Dimensions | 19.5×18.5×9 in | ~25×18-1/8×10-1/4 in | 20×18×9 in |
| Weight | Not published | Not published | 3.2 lb |
| Material | One-piece HDPE, UV-protected | HDPE, UV-protected | HDPE, max UV protection |
| Airflow feature | Standard vent area | Constant airflow for powered fans | Aerodynamic redesign |
| Mounting | Zero-leak, no roof holes | EZ Clip hardware | Zero-leak, no-drill |
| Warranty | 6-year limited | Not published | Not published |
| Bug screen | Not published | Sold separately | Not published |
| Check Price | Check Price | Check Price | Check Price |
| Feature | Maxx II 00-933081 | Ultra Breeze U1400WHS |
|---|---|---|
| Fitment | Standard 14×14 in vents | All 14×14 in roof vents |
| Dimensions | 22.08×18.15×9.72 in | 10-1/4×19-1/2×23 in |
| Weight | 3.43 lb | Not published |
| Material | One-piece HDPE, UV protected | Not published (airfoil design) |
| Airflow feature | 2× Original vent area (maker) | Up to 95% airflow retained |
| Mounting | Hinged brackets; 3/16-in holes in vent frame | No drilling; hardware included |
| Warranty | 6-year limited | Not published |
| Bug screen | Removable, behind louvers | Not included |
| Check Price | Check Price | Check Price |
Fitment and installation
Start with a tape measure, not a shopping cart. Confirm the vent opening is the standard 14×14 inches, then measure the lid’s travel if you have a powered or Fan-Tastic fan — lid travel is the measurement that causes returns. The Original, Maxx I+ and Maxx II use zero-leak no-drill systems, so the roof itself stays untouched; the Maxx II’s hinged brackets are the exception, needing 3/16-inch holes in the vent frame, not the roof. The Ultra Breeze installs without drilling and ships all hardware. Whichever cover you fit, leave the 1/2 to 1-inch gap underneath uncaulked: Maxxair’s FAQ says that gap lets condensation and wind-blown rain escape, and sealing it shut creates the leaks you bought the cover to prevent.
Pair the install with a flange inspection: reseal the vent flange and screw heads with self-leveling sealant or butyl tape while you are on the roof, and add the cover to your seasonal roof walk. Our essential accessories guide, the accessories category and the maintenance checklist cover the same ladder-up, seal-it-while-you-are-there routine for other roof and recovery gear; if you are new to DIY installs generally, our DIY how-to guides show the measure-twice culture we apply here too.
Safety essentials
Six rules that outrank any vent cover in this review:
- 1. The roof is a work surface, not a walkway. Stay on the rafters or a rated roof ladder, wear soft soles, and never step on a vent lid or skylight dome.
- 2. Lock out 12V power before working around a powered vent fan. A Fantastic Fan or MaxxFan blade does not care that you are only fitting a cover.
- 3. Check the weather before going up. Wet EPDM and TPO roofs are skating rinks; fit covers on a dry, calm morning.
- 4. Seal the flange, not the cover’s breathing gap. Caulking the 1/2 to 1-inch underside gap traps condensation — Maxxair’s FAQ is explicit about this.
- 5. Treat hail-season damage as a maintenance item. A cracked cover is a funnel, not a shield — inspect after every major storm.
- 6. Keep a buddy or a phone within reach on roof work. Every rule above assumes someone knows you are up there.
Three verified accessories for the safety-critical part of this job — the seal under the vent, not the cover above it:
Dicor 501LSW-1 self-leveling lap sealant — for the vent flange and screw heads on horizontal roof surfaces; compatible with EPDM and TPO:
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Dicor BT-1834-1 butyl seal tape — moldable bedding under the vent flange that never hardens:
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HVAZI stainless screw and nut assortment — corrosion-proof #6-32 UNC replacement hardware so the cover’s fasteners do not rust out first:
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More sealing and mounting gear lives in our essential accessories guide, the accessories category and our cover buying guide — the same UV-and-weather logic, different roof hardware.
Troubleshooting
Five failures owners report, with the cause and the fix straight from the maker FAQ and the owner threads.
| Symptom | Cause | Fix |
|---|---|---|
| Vent lid will not open fully under the cover | Lid-travel clearance: cover body too low or too small for the fan | Measure lid travel before buying; Fantastic Fan owners should fit the Ultra Breeze, the only cover owners report clears that lid |
| Water dripping from the vent in rain | Cover underside gap caulked shut, trapping condensation and wind-blown rain | Reopen the 1/2 to 1-inch underside gap — Maxxair’s FAQ says never caulk it |
| Cover rattles or lifts in wind | Loose brackets or wrong-size cover on the vent frame | Re-torque the EZ Clip or bracket hardware; confirm the cover matches the vent opening size |
| Cover yellowing, brittle or crumbling | UV degradation of thin or unprotected plastic | Replace with UV-protected HDPE (all five picks here); the Original has 12-year owner reports |
| Cover blocks too much interior light | Black or dark cover chosen for aesthetics | Swap to white or smoke — one iRV2 owner regrets black and would choose white or smoke next time |
| Airflow drops over the seasons | Dirt and debris packed behind the louvers | Open the Maxx II’s hinged brackets and clean; inspect other covers from below each spring |
Who should NOT buy these
You run a MaxxFan Deluxe with its built-in rain shield. It runs in ceiling-fan mode with the lid closed, so a vent cover buys you almost nothing. Put the money toward the fan itself instead — our 12V power guides cover the same battery math your fan needs.
Your RV lives in a garage and never sees rain. A vent cover’s entire job is vent-open-in-rain; a garaged rig does not have that problem. Spend the budget on flange sealant instead — see our essential accessories guide.
You have not measured your vent. Non-standard openings and tall fan lids are where vent covers become returns, not reviews. Measure the opening and the lid travel first; our Haloview backup camera review shows the same measure-twice roof-work discipline on a different roof device.
You came here looking for recovery gear. “Vent covers” shares a word with winch covers, but this is an RV roof accessory. If you need pulling power, start with our truck winch guides instead.
You expect a cover to make the vent hail-proof. It will not — owners have lost covers to hail, ice storms and branches. Treat post-storm inspection as maintenance, the way our maintenance checklist treats every other piece of exposed gear.
Final verdict
Best overall — MAXXAIR Original 00-933066: the proven benchmark with the 6-year warranty and the 12-year owner record.
Best for high-powered fans — MAXXAIR Fanmate 00-955002: Maxxair’s own FAQ pick for powered ventilator fans.
Best updated design — MAXXAIR Maxx I+ 00-933051: the aerodynamic redesign of the Original for standard vents.
Best airflow and easiest to clean — MAXXAIR Maxx II 00-933081: twice the Original’s vent area per the maker, with hinged brackets.
Best for Fan-Tastic Fan owners — Dometic Ultra Breeze U1400WHS: the only cover owners report lets that lid open fully.
FAQ
Will a vent cover fit my 14×14 roof vent?
All five covers in this review are made for the standard 14-inch by 14-inch roof vent opening, per their makers — the Original, Maxx I+ and Maxx II for standard vents, the Fanmate for powered fans on standard openings, and the Ultra Breeze for all roof vent types. But measure anyway: BestReviews’ standing advice is that Original-style covers will not fit all fan assemblies, and owner fitment complaints almost always trace to an unmeasured vent. Measure the opening and, for powered or Fan-Tastic fans, the lid’s travel too.
Can I run my powered vent fan in the rain under a cover?
Yes — with the right cover. Maxxair’s own FAQ recommends the Fanmate for high-powered ventilator fans because Standard-style covers restrict their airflow; the Maxx II is only the acceptable alternative when roof space is too tight for a Fanmate. Owners report running a Fanmate open in rain over a powered fan with no water intrusion. Do not put a Standard-style cover over a high-powered fan and expect full airflow — the maker itself says it will choke.
Will the cover stop my vent lid from opening fully?
It can, and it is the most common real complaint in the owner threads. Airstream Forums owners report the Ultra Breeze is the only cover that lets a Fan-Tastic Fan door open completely — the MaxxAir cover does not. An iRV2 owner found a MaxxAir II over a bathroom vent did not let the lid fully open either. The vent opening and the lid travel are two different measurements; check both before ordering, especially with powered or oversized lids.
Do vent covers yellow, crack or crumble in the sun?
UV life is the number-one differentiator in this review. iRV2 owners report MaxxAir covers still in excellent condition after 5 and 12 years, while a competing Camco set was sun-destroyed and crumbled within 2 years. BestReviews notes Camco covers yellowing easily and feeling flimsy, and rvpioneers reports the Ultra Breeze becoming brittle and breaking after normal sun exposure. Every pick here uses UV-protected high-density polyethylene, but sun-belt owners should still weigh the owner record, not just the material claim.
White, smoke or black — which color vent cover should I buy?
White is the default for a reason: it reflects heat and diffuses daylight into the coach. Smoke admits good interior light while cutting glare — Airstream owners specifically praise the smoke Ultra Breeze for this. Black absorbs heat and blocks light, and one iRV2 owner who bought black for aesthetics says it blocked far too much light and they would choose white or smoke next time. In hot climates, treat color as a thermal decision, not a styling one.
Will a vent cover survive hail?
No plastic vent cover in this review is hail-proof, and owners have the damage photos to prove it. Forest River Forums members describe hail shattering vent covers and a tree branch breaking one open, while a Thor Forums owner lost a white Maxxair cover to an ice storm. One owner switched to a metal lid specifically because it cannot crack from hail. Factor your exposure and storage: if you park under trees or in hail country, budget for possible replacement.
Do I need to drill my roof to install a vent cover?
No — not the roof. The Original, Maxx I+ and Maxx II use zero-leak no-drill systems that put no new holes in the roof, and the Ultra Breeze installs without drilling with all hardware included. The one exception: the Maxx II’s hinged brackets need 3/16-inch holes in the vent frame itself, not the roof. And leave the 1/2 to 1-inch gap under the cover uncaulked — Maxxair’s FAQ says that gap lets condensation and wind-blown rain escape.
Will a vent cover reduce heat or air-conditioning load?
Indirectly, yes — that is the point of vent-open-in-rain. Leaving the vent open through a storm moves hot air out without running the AC, and white covers reflect heat off the roof. The Maxx I+ listing’s customers describe help with heat, though we treat listing summaries as thin evidence. For real climate control, pair the cover with an interior vent insulator — the LATCH.IT 2-pack in our pair-it-with sections — because a cover manages airflow, not insulation.
How do I maintain a vent cover?
Once a year, open the Maxx II’s hinged brackets — or reach under the others — and clear leaves, grit and nests that restrict airflow; dirt behind the louvers is a documented airflow killer. Inspect the vent flange sealant at the same time and reseal with self-leveling sealant or butyl tape while you are on the roof. After hail or ice storms, check for cracks: a cracked cover funnels water instead of shedding it. Never caulk the underside breathing gap shut.
Sources & changelog
Manufacturer sources
- Maxxair Original product sheet — fitment, dimensions, materials, 6-year limited warranty
- Maxxair FAQ — Fanmate recommendation for high-powered fans, airflow restriction warning, 1/2 to 1-inch underside gap
- Maxxair II instruction sheet — dimensions, hinged brackets, louver design
- Dometic 2016 RV product catalog — Ultra Breeze airfoil design, 95% airflow, dimensions, order numbers
- Maxxair MaxxFan Deluxe product page — maker lineup confirmation
- Manuals.plus ASIN record — MaxxFan Deluxe 00-05100K specifications
Owner and buying-guide sources
- iRV2 — owners: MaxxAir covers excellent at 5 and 12 years; Camco set sun-destroyed in 2 years; black-cover light-block regret
- iRV2 — owner: MaxxAir II on a trailer; complaint that it blocked full lid opening over a bathroom vent
- Forest River Forums — owners: Fanmate dealer recommendation; open-in-rain with no water intrusion over a Create-A-Breeze fan
- Forest River Forums — hail shattering, branch breakage, metal-lid switch; UV-resistant lid longevity
- Airstream Forums — owner: Ultra Breeze the only cover letting the Fantastic Fan door open completely
- Airstream Forums — owners: 4 years with no storm or wind issues; smoke color interior light
- Thor Forums — owner: white Maxxair cover broken in an ice storm
- rvpioneers — side-by-side: thicker Maxxair stress points vs Camco; Fanmate overkill note; Ultra Breeze brittleness
- BestReviews — measure-before-buying caution; Camco yellowing and flimsy-plastic complaints
Excluded for lack of a verified listing this pass: Camco 40431, the Camco Aero-Flo line (407xx), Heng’s and RecPro vent covers — named only where the owner sources cite them.
Changelog — October 23, 2026: guide first published.
By Leo, Founder, WinchInsider
Leo founded WinchInsider to publish specification-first truck, towing and RV guides: every figure from the maker, every complaint printed, and no product recommended for a job its maker does not claim it can do. Read more about WinchInsider.
Related guides
- Vent covers — the full subcategory archive
- RV & camper accessories — the parent archive
- Haloview backup camera reviews — the same roof-work routine
- Best winch cover — UV and weather claims judged the same way
- Essential winching accessories — sealing and mounting gear
- Winch maintenance checklist — the twice-a-year rhythm