Electrical and Systems
RV Roof Vent, Powered Fan and Ventilation System Repair
Typical range
$300 to $3,500
Shop hours
1 to 14
Labor rate
$260/hr
The short answer
Ventilation work covers cracked vent lids, failed powered fans, range hood and bath exhaust repair, and upgrades to variable speed rain sensing fans. Work runs $300 to $3,500, or 1 to 14 hours at $260 per hour plus parts, including reflashing and resealing the roof opening.
01
What this work actually involves
Roof vent lids are the most reliably UV destroyed component on any Southern California RV. The acrylic goes chalky, then brittle, then it shatters the first time it is opened, usually in a coach stored uncovered in Riverside, Corona, or the low desert. Owners tape over the hole and drive on, which is how a $60 lid becomes a ceiling and subfloor repair. When we replace a lid we also inspect the garnish and the flange seal, because the same UV exposure that killed the lid has been working on the sealant for the same number of years.
Powered fans fail at the motor, the lift mechanism, or the rain sensor. On older units the lift arms bind, then the motor stalls trying to move them and burns out. Replacing the motor without freeing the lift just burns the next motor. The upgrade owners actually appreciate is a variable speed reversible fan with a rain sensor and a thermostat, because a proper fan moving air through the coach is dramatically more effective at handling low desert heat than most people expect, and it costs a fraction of what a second air conditioner does.
Ventilation is also a moisture problem, not just a heat problem. A bath fan that no longer moves air and a range hood that vents into a cabinet instead of outside put every shower and every pot of boiling water into the wall cavities. On coastal stored coaches that shows up as mildew on the ceiling and soft window frames. Getting the exhaust paths actually working outside is one of the cheaper things an owner can do to protect the interior.
Systems and brands we work on: Dometic, Coleman, Furrion.
Location: All work is performed at our Yorba Linda facility. We do not offer mobile, roadside, or fleet route service.
02
What the job includes
- Roof vent lid replacement including UV shattered and missing lids
- Vent flange reflashing, resealing, and rotted deck repair at the opening
- Powered roof fan motor, lift mechanism, and rain sensor repair
- Upgrade to variable speed, reversible, thermostat controlled fans
- Bath exhaust fan replacement and duct routing to the exterior
- Range hood fan, filter, and vent flap repair or replacement
- Refrigerator roof vent and lower vent airflow correction
- Insect screen replacement and garnish trim repair
- Dedicated fused circuits for added or upgraded fans
- Water testing of every roof penetration after the work
03
When you need this service
- A vent lid that is cracked, chalky, missing, or taped over
- A powered fan that hums but will not open or will not spin
- Water staining on the ceiling around a vent flange
- Persistent condensation on windows and mildew smell after showers
- A range hood that runs but pushes no air outside
- A refrigerator that struggles in heat with blocked roof vent airflow
04
How we do it, step by step
- 01
Roof and opening inspection
Every vent, flange, and sealant bead inspected on the roof. Lids and sealant age together, so a shattered lid usually means the flange seal is due as well.
- 02
Deck condition check
The roof deck around each opening probed for softness. A vent that has been leaking has usually compromised the plywood, and a new lid on a rotten opening solves nothing.
- 03
Fan mechanism diagnosis
Motor, lift arms, and control tested separately. A binding lift stalls a healthy motor, so freeing the mechanism has to happen before a new motor goes in.
- 04
Exhaust path verification
Bath and galley exhaust traced to where they actually discharge. Hoods venting into a cabinet or a wall cavity are common and they put moisture straight into the structure.
- 05
Installation and sealing
Lids, fans, and flanges installed with sealant matched to the roof membrane, fasteners bedded, and any added circuit run and fused properly.
- 06
Water test
Every disturbed penetration water tested and airflow verified at each fan before the coach is released.
05
Pricing and posted rates
| Item | Rate or range | Notes |
|---|---|---|
| Typical job range | $300 to $3,500 | Varies with extent of damage and parts availability |
| Shop hours | 1 to 14 | Quoted after teardown, not before |
| Mechanical and electrical labor | $260 per hour | 2026 posted rate |
| Parts | 100% markup under $100, 35% over | Special order parts require a non refundable deposit at order |
| Deposit | 50% at authorization over $2,000 | Additional 25% when parts arrive on jobs over $10,000 |
| Sales tax | 7.75% on parts and materials | Labor is not taxed |
Insurance billed jobs may be billed at carrier negotiated labor rates that differ from the posted retail rates above. See all posted rates.
06
On the insurance side
Where a shattered or missing vent lid let water into the ceiling and wall, we document the opening and the moisture path so the water intrusion can be evaluated separately from the vent replacement itself.
07
Vehicles we do this work on
Vehicle
Class A Gas Motorhomes
A Class A gas motorhome is a flat-front coach built on a Ford F53 or Workhorse front-engine chassis, typically 28 to 38 feet. Rear
Vehicle
Class C Motorhomes
A Class C is a coach body built onto a cutaway van chassis with a sleeping or storage cabover extending above the factory cab. Tha
Vehicle
Travel Trailers
A travel trailer tows from a ball hitch behind the tow vehicle rear axle on an A-frame tongue, which makes it the most sway-prone
Vehicle
Standard Fifth Wheels
A fifth wheel couples to a hitch in the truck bed through a kingpin and pin box, with a raised forward bedroom over the truck. The
Vehicle
Truck Campers, Slide-In
A slide-in truck camper sits in a pickup bed and is clamped down at four points, so it absorbs the truck frame twist directly. Jac
Vehicle
Camper Van Conversions
Camper van conversions are Sprinter, Transit, or ProMaster chassis with windows cut into the sidewalls, a roof full of penetration
Vehicle
Toy Hauler Trailers
A bumper pull toy hauler carries cargo behind the axles on a ball hitch, which is the worst possible combination for tongue weight
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Questions about ventilation system repair and upgrade
Frequently asked questions
How much does roof vent and fan work cost?
Work runs $300 to $3,500, or 1 to 14 hours at $260 per hour plus parts. A single lid replacement with resealing is at the low end. Multiple powered fan upgrades with new circuits, a bath fan, a range hood, and deck repair at a leaking opening is at the high end.
My vent lid shattered. Can I just tape it until my next trip?
Tape is a drive-home measure, not a plan. An open roof penetration in a Southern California rain event puts water directly into the ceiling and down the wall, and that repair is orders of magnitude more expensive than a lid. UV shattered lids are one of the most common causes of the ceiling damage we end up repairing.
Will a good roof fan actually help in desert heat?
More than most owners expect. A variable speed reversible fan pulling air through the coach with a window cracked moves a large volume of hot air out and drops interior temperature meaningfully, and it runs on a fraction of an amp compared to an air conditioner on a generator. It is not a substitute for cooling, but it extends what is comfortable.
Why is my bathroom always damp and smelling of mildew?
Almost always a bath fan that no longer moves real air, or one that was never ducted outside properly. Every shower puts a significant amount of water vapor into the coach, and if it does not leave it condenses in wall cavities and around windows. We verify where the exhaust actually discharges, not just that the fan spins.
Does the refrigerator vent matter?
A great deal on an absorption refrigerator. The unit rejects heat through the rear coils and relies on convection from the lower sidewall vent up through the roof vent. Blocked or poorly baffled airflow there is one of the main reasons absorption units fail to hold temperature in low desert heat. We check it as part of ventilation work.
09
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Ready to move on ventilation system repair and upgrade? Bring it to Yorba Linda.