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Dometic FanTastic Roof Vent w/ 12V Fan and Thermostat - Powered Lift - 14-1/4" x 14-1/4"

Dometic FanTastic Roof Vent w/ 12V Fan and Thermostat - Powered Lift - 14-1/4" x 14-1/4"

Item # FV803350
Our Price: $381.78
You Save: $129.21
RV Vents and Fans
Shipping Weight: 12 lbs
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The rain sensor on this thermostat-controlled roof vent ensures that the dome closes and the variable-speed, reversible, 12V fan shuts off when rain or snow hits. Powered lift eliminates hand cranking. Great Prices for the best rv vents and fans from Dometic. Dometic FanTastic Roof Vent w/ 12V Fan and Thermostat - Powered Lift - 14-1/4" x 14-1/4" part number FV803350 can be ordered online at or call 1-800-940-8924 for expert service.
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Dometic RV Vents and Fans - FV803350

  • Vent
  • Roof Vent
  • 12V Fan
  • Reversible Fan
  • 14W x 14L Inch
  • Tinted
  • Dometic
  • Powered Lift
  • 4-1/2 Inch
  • Plastic

The rain sensor on this thermostat-controlled roof vent ensures that the dome closes and the variable-speed, reversible, 12V fan shuts off when rain or snow hits. Powered lift eliminates hand cranking.


  • Roof vent with reversible 12V fan pushes stale air out of and pulls fresh air into your RV, camper, or enclosed trailer
  • Variable-speed fan offers 2 modes of operation
    • 3 Manual speeds let you boost or reduce airflow as needed
    • Automatic, thermostat-regulated settings conserve energy by running only when preset temperature is reached
  • Rain sensor signals dome to automatically close and fan to shut off when wet
    • Powered arm opens and closes hinged dome - no hand cranking needed
    • Fan resumes when sensor is dry
  • Knob on vent housing allows you to operate dome by hand in case of power failure
  • Pop-out screen keeps insects out and easily detaches for cleaning
  • 10 Clear fan blades allow sunlight into RV
  • Smoke-colored polyethylene dome filters UV rays while allowing light in
  • White interior polypropylene trim (or garnish) and roof flange are included
    • Smooth edges won't cut you during installation
  • Simple installation with 2-wire design
    • Hardware included
  • Made in the USA


  • Application: RV, camper, and trailer roofs up to 4" thick
    • Rough opening size: 14-1/4" x 14-1/4"
  • Vent extends above roof:
    • 4-1/2" When closed
    • 11-1/2" When open
  • Fan motor:
    • Capacity: 920 CFM
    • Voltage: 12 volts
    • 4-Amp slow blow fuse
  • Warranty:
    • 2-Year limited on vent assembly
    • Lifetime on dome (lid)

This roof vent has a built-in 12V fan that uses a thermostat to help maintain an even temperature inside your RV, camper, or enclosed trailer. You can also control the dome and fan manually with a built-in hand knob or with controls on the vent housing. A rain sensor is included as well to signal the dome to close and the fan to shut off when it gets wet.

Ceiling Vent and Fan with Thermostat

Air out your RV after cooking or just draw in some fresh air while you sleep. This variable-speed ceiling fan operates in 2 modes: manual and automatic. The fan activates when you move the fan blade rocker switch to the in or the out position, which designates the direction of airflow.

When using the automatic mode, you can preset the fan to maintain a desired temperature inside your RV. The thermostat dial is color coded, with dark blue representing the coolest setting and dark red representing the warmest setting. The fan's internal thermostat will sense the actual room temperature, and the fan will run until the preset temperature is achieved. When the temperature rises above the preset temperature, the fan will automatically kick on again. So when you go out, you don't have to waste energy by leaving the vent running at full blast just to ensure that your RV is cool when you return. And because the fan will activate anytime that the preset temperature is reached, you can set up the system to ensure that your pets remain comfortable while you're out.

To control the fan manually, turn the speed knob on the vent housing. There are 3 speeds: low, medium, and high. There is also an off position.

Power Lift and Rain Sensor

Fan Tastic Vent Lift Dome

This vent has a powered lift arm for the dome, so you don't have to manually crank it open or closed. The dome automatically opens when you turn on the fan. You can also use the small rocker switch on the vent housing to open and close the dome when the fan is not running. And a hand knob is built in so that you can operate the dome in the event of a power failure.

A moisture sensor ensures that the dome will close when rain or snow hits. So you can leave the vent running or preset it to run at a certain temperature, even if the forecast calls for rain. When the sensor gets wet, it signals the dome to close. With the dome closed, the fan blades will stop running. When the sensor dries, the dome will re-open and the fan blades will resume operation. To keep the sensor from activating in rain, snow, or humid and dewy conditions, simply add a vent cover (sold separately) to block moisture.


This vent requires a 14-1/4" x 14-1/4" opening in your trailer's roof and ceiling. To replace an old vent, install this vent into the existing opening. If your roof does not already have a vent, you will need to mark and cut an opening between roof joists to install this unit. And the 2-wire design makes it easy to have your vent hooked up and ready for use.

9108870059 Dometic Fan-Tastic Vent Series 3350 Trailer Roof Vent with 12-Volt Fan - Power Lift Top - 14-1/4" x 14-1/4"

Replaces Fantastic Vent 803350

Customer Satisfaction Score:

Customer Reviews

Dometic FanTastic Roof Vent w/ 12V Fan and Thermostat - Powered Lift - 14-1/4" x 14-1/4" - FV803350

Average Customer Rating:  4.5 out of 5 stars   (67 Customer Reviews)

The rain sensor on this thermostat-controlled roof vent ensures that the dome closes and the variable-speed, reversible, 12V fan shuts off when rain or snow hits. Powered lift eliminates hand cranking.


The (2)fan lid black plastic mounting bosses broke as if they had deteriored in the sun. This lower the lift arm to flop down and keep the lid from opening. Trying to figure a method to repair.

Etrailer Expert

Jenny N.


Your best bet on repairing it would be to replace the lid. We have them available as part # FVK1020-19.


etrailer has always been a reliable supplier, fast shipping and excellent customer service. They are as close to an [online vendor] as possible, for logistics and for the products they sell.

The fan works perfect



A year later - works perfect - it was the right choice. Easy install, reliable roof vent fan.


This powered roof vent is great! I mounted it above the cab in my 1991 high-top conversion van to provide cool air when camping in it. Fan is more powerful than I expected! I rarely need to switch it to high speed. It's quiet enough for sleeping just a few feet away. Installation was easy and dimensions were accurate. Controls are easily accessible. Auto temp control is really nice when outdoor temps are dropping during the night so we don't get too cold. Rain sensor triggers to close cover after only a few drops of rain! Reversible fan is nice.


Absolute waste. It seems like when the company was sold they changed the programming and instead of fixing it or giving customers an option (read: a simple switch!) they made it so the rain sensor just shuts it permanently absolutely destroying any usefulness of the rain sensor. Customer service doesn't even understand the problem (e.g. getting up at 3 am because of a 2 minute rain at midnight to cycle the fan power) or alternative uses (e.g. using the fan to prevent overheating for longer periods- an all day hike). It now just closes permanently a the first drop of rain instead of reopening when the sensor is dry.

I literally ripped this brand new fan out two weeks after install and a year later it's still sitting on my workbench because I refuse to hobble someone else with this absolute piece of garbage before I get a chance to override the problem with an FRM01 12v relay computer. I haven't bothered because 1. I have a better fan (the old version I was lucky enough to find) 2. this one has a chimney which sits up 2" higher 3. the new motor is weak enough that even if nothing else was wrong it would still be a mediocre fan.

The old model has a horizontal front hinge and a black motor housing that extends into the lid. Beware a lot of images of the old model are still used in listings for the new model.


Lid broke a few days after install. You guys would not replace the lid without taking the rv into shop. The rv is not movable and I asked just for a replacement lid. I never got problem resolved and it’s still broken.


The vent only opens and closes if the fan is actively running. Kind of annoying. I just want to open and close regardless of fan running or not but that is not an option. So for instance...say I just want to open the vent but I do not need the fan..nope. You need to turn the fan knob to on...then toggle the open/close switch.

And further... First trip with it the plastic vent cover broke right where the metal lift arm attaches. This is the worst. I can deal with the vent/fan working in an odd combination but the fact that it broke already is very poor.

Hope I can get in contact with someone at etrailer about this.

Etrailer Expert

Jenny N.


I will have our Customer Service team reach out to you. I reached out to the manufacturer about opening the lid without running the fan. They advised that you can use the knob that is attached to the lift motor to open the vent while the fan is off.



Etrailer Expert

Jenny N.


You mentioned that the power switch for raising and lowering the lid was not working. I reached out to the manufacturer who advised that it could be the switch or a power issue. If you are interested, you can take it to a service center to have it looked at since it is still under warranty. It does have a limited lifetime warranty.


Perfect fit, just what I needed, always fast shipping and great customer service from


Great fan so far, altho I did just install it. Installation was easy as it could be.

The operating instructions are far from complete. There's a specific way to operate these functions but it's not mentioned anywhere in the instructions. Main power switch needs to be on for anything to work (obvs), as well as the fan speed needs to be on at least one for the top to open, the fan won't turn on until the top is open. So power on, fan speed on, then vent can open, then fan turns on. It's a little confusing. I had to watch a video in order to get this unit working. Initially I thought it was hooked up wrong, then thought the unit was bad. Could of saved 30 mins of head aches if the instructions spoke of this.


Replacement for the original circa 1995. Can't beat that! Good price, fast delivery.


Fan works great especially with remote


This was a perfect replacement for our old fan (model no longer available). etrailer suggested this replacement and we’re so pleased with it. Install was easy after we figured out our wiring (found past posts in etrailer site for help). Thanks so much!!


The quality looks very good ! I just received the package and have not installed the fan yet.
I do like buttons on the fan instead of on a remote control. More direct.
The price was great and the service was fantastic !!.
I know this fan will fit perfectly as upgrade for replacement on my old fan.


All items were delivered in good condition in two separate deliveries over a two day period. There was only one tracking number for two deliveries, so when they first delivery was made, I couldn't track the remaining order...making me believe the remainder of my order was not shipped. This was very frustrating. Two or more separate boxes coming on one order should have their own tracking number, letting the customer know they're still on transit.


I love the fans. I bought two and they help keep my rv's temperature at a reasonable temp. I would rather have fresh air than use the air conditioner.


Package arrived damaged, but fan appears to be acceptable. etrailer provided a good price and shipping. I have purchased from them many times and have always been pleased!


This is an excellent product. Our unit is a 2007 Coachhouse Platinum 231SD which had two fantastic fan factory vents. The fans units were aging and one was leaking so I ordered two upgraded units.

The installation was quite easy actually. I removed the old units, cleaned the openings of old putty and Dicor, installed new sealing putty tape, used the old screws to attach the new units and applied new Dicor self leveling sealer. Just have to make sure you get the old sealer and putty cleaned off before installing the new units. I then reconnected the wiring for each unit and installed the new surrounds.

The old units were a lower profile than the new units owing likely to the larger reversible fan blades requiring more headroom which I do not see as a problem. I also had to trim the new surrounds so they would fit flush with the ceiling.

What made it so much easier was the product itself being the exact fit and finish for my application.


Installed on my 2003 5th wheel. The best part is the rain sensor to close it!! Shudda bought this years ago. Great product and as always, here on eTrailer, MY "Go To" store. I always seem to shop this site, simply the best for products and SERVICE.


The fan-tastic is a great product, I have had several on my r vs in the past 30 years.I wouldn't be without one. They are easy to install. Melissa T at e-trailer was great helping me. I have bought several things from e-trailer, and have never been disapointed.


It was OK for a week, then the powered opener quit. The thermostat works fine. I just ordered a hood for it, so the lid can stay open.


I have not installed the product yet, but it is exactly what I ordered. It is a replacement, so I'm sure it will be just fine when I put it in. All the pieces are the same as what I took out. Delivered quick and in good condition.


Love the fan. Replaced an origonal vent on 1976 GMC Motorhome. Required a little cutting as the old vent had rounded corners.


Excellent product and easy to install. The Product did arrive with some slight damage but etrailer send me a new part right away. Highly recommend dealing with etrailer.


The vent roof fan works very well


etrailer is my "go to" place for rv accessories, everything I've received from them has been delivered on time, and the products are quality. They pack the merchandise very well, nothing to date has arrived damaged. I am very satisfied with the products and service I receive from them.

Show More Reviews

See what our Experts say about this Dometic RV Vents and Fans

  • Fan-Tastic Vent Fan FV803350 Compatibility with Existing RV Wall Switch
    You should be just fine replacing your two roof vents with the Fan-Tastic Vent Roof Vent # FV803350 since these fit the standard 14-1/4 x 14-1/4-inch RV roof opening size. Since you are replacing two 12V powered vents with two similar units your existing switch should work but the air direction and thermostat functions will be operable on the new fan units themselves. If you want to check it for an amperage rating that's not a bad idea. Each of the Fan-Tastic Vent Roof Vents # FV803350...
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  • Fantastic Vent 3300 Compatibility With 3350 Model
    Yes, your current 3300 series is compatible with the Fan-Tastic Vent Roof Vent, # FV803350. It is plug and play for the lower portion same with any other fan model beginning with 33 for model number.
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  • Solution for Needing Different Color Fan-Tastic Roof Vent Garnish
    Fan-Tastic vents only offers white garnishes with their vents like the # FV803350 so what you could do is get a spray that works on plastic and you could paint it to match your RV interior better.
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  • How to Correct Squeak in Dometic Rain-Sensing RV Vent with Fan
    If your Airstream's Dometic powered vent has a visible accumulation of soils from regular use keeping the trailer free of cooking odors then you can certainly clean the fan blade and other accessible surfaces. It sounds like the squeak is coming from the fan motor itself, though, so for that I suggest a very light application of WD40 or a similar lubricant. If the squeak reliably stops after a moment or two then to be perfectly honest I would do nothing to the fan/vent other than clean...
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  • Fan-Tastic Vent Roof Vent with Fan and Thermostat Amperage Draw
    I reached out to the manufacturer and the techs don't have that amperage for each speed of the Fan-Tastic Vent Roof Vent w/ 12V Fan and Thermostat # FV803350. They said that at start-up the fan will pull 3.5 amps but running will remain well under that amperage. The unit has a slow blow 4 amp fuse so it will not pull minimal amperage at 12V for continued operation.
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  • Is There A Roof Vent Fan That Will Not Require Me To Drill Into My Roof
    The Fan-Tastic Vent Roof Vent w/ 12V Fan and Thermostat - Powered Lift - 14-1/4" x 14-1/4", part # FV803350, or any other compatible roof vent, will need holes drilled in the roof if the holes in your roof and the vent do not match. I have included a review of the Fan-Tastic Vent Roof Vent below.
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  • Will Fan-Tastic Vent Roof Vent Fit Opening From Old Bracket With Different Dimensions
    I'm assuming you measured the dimensions of the opening on the garnish to get that 13-1/2" measurement. The actual garnish opening on the Fan-Tastic Vent Roof Vent # FV803350 is going to match your old bracket measurement. This roof vent fits a 14-1/4" x 14-1/4" opening which is the standard for all modern vents. The leg of the garnish that actually comes with it also measures 4-1/2" and fits roofs up to 4" thick. Regardless, like any garnish the leg/depth can be trimmed down to fit your needs.
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  • Will Fan-Tastic RV Roof Vent Replace Vent of Heartland RV Cyclone
    The Fan-Tastic RV roof vent part # FV803350 that you referenced is designed to fit the standard RV roof vent opening of right at 14 inches so it would easily fit in place of the vent you have now. Essentially all of the RV roof vents are designed to fit the same opening dimensions.
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  • Will Fan-Tastic Vent Roof Vent Work With Solar-Powered System
    Since you said your solar powered system is 12V, it would work great with the Fan-Tastic Vent Roof Vent, part # FV803350, as long as it provides at least 4 amps. This vent has a powered lift and a built-in rain sensor, and has 3 speed settings to let you control the air flow. This fan is designed for roofs up to 4 inches thick and the rough opening needed for installation is 14-1/4 x 14-1/4 inches.
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  • Troubleshooting Fan-Tastic Roof Vent FV803350 That Doesn't Open Or Close
    First thing you will want to check is that the fan has power and is grounding properly. You can try using jumper wires to the vent wiring that are run to known ground and power to see if that works. Next, you can check the fuse of the fan to make sure it is not blown. Near the speed setting is a plug that holds a 4 amp fuse. I attached a picture that points out where it is. If the fan still works when you manually open the lid that would indicate a problem with the lid motor. Since this...
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    Image 1 for
  • 3-Speed Non-Thermostat Fan-Tastic Roof Vent Recommendation that is 14 inch by 14 inch
    Sounds like you are looking for the part # FV801200. This is a very similar roof vent to the part # FV803350 you referenced at a lower price point that does not have the thermostatic features. I attached a review video for this vent for you to check out as well.
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  • Operation of Rain Sensor and Automatic Fan on Fan-Tastic Vent Roof Vent FV803350
    Yes, the Fan-Tastic Vent Roof Vent # FV803350 has a rain sensor that will close when it rains or snows but then re-open once it dries. The fan will also automatically re-start once the dome has opened.
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  • Replacing or Repairing Rocker Arm on Fantastic RV Roof Vent
    When repairing or replacing the rocker arm like # FVK8011-05 on your Fan-Tastic Roof Vent, you shouldn't need to remove the entire fan assembly. Working from inside the trailer/RV and looking up into the unit, you should be able to first remove the screen. With the screen removed, you will want to remove the knob which is likely held in place with a screw. You may then need to remove a plastic tray which will give you access to the rocker knob. You can then see if anything has broke or...
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  • Replacing Fan-Tastic Vent Roof Vent 4175 with Fan-Tastic Vent Roof Vent FV803350
    The Fan-Tastic Vent Roof Vent part # FV803350 installs a bit differently than the Fan-Tastic Vent Roof Vent 4175. This unit has its own built-in controls so it wouldn't wire up to a wall switch, there are simply two wires you need to connect; power and ground. Therefore, all you need to do is test the wires going to the old fan and find the ground/power then attach them to this new unit.
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  • Replacement Vent for 1999 American Eagle MH
    The Fan-Tastic Vent Roof Vent # FV803350 comes with all of the features you have now. This doesn't include a switch but you will be able to wire it to your existing switch if you wish to continue using it. We also have the # FV807350 which comes with a remote if you would prefer the remote to a switch. This could vent could also be wired to the switch giving you multiple options for operation.
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  • Availability of Replacement Fan Blade Screw for 8000SD6WH Create-A-Breeze Vent Fan
    The specific screw you're needing to hold the fan blade to the motor shaft on your older model Create-A-Breeze Fan is no longer available. You might be able to find some replacement hardware from an online re-seller, but the screw itself isn't produced anymore. Your best option at this point is really to replace the fan assembly itself. For this the Fan-Tastic Vent Roof Vent # FV802250 will work really nicely. It fits a rough opening size of 14-1/4" x 14-1/4" and features a variable-speed...
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  • Replacement RV Roof Vent for Fan-Tastic Roof Vent 6500
    The Fan-Tastic Roof Vent 6500 you have fits the standard 14 inch square opening so for a replacement the # FV803350 would fit and work great. This has a large fan in it to move a lot of air, a thermostat, a powered lift, and a rain sensor that closes it whenever it rains.
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  • Solution for Fan-Tastic Roof Vent 2000 BTS-B that Has Broken Motor Mount
    Your Fan-Tastic roof vent is old enough that we don't have the individual part you are looking for so the best option we have would be the Fan-Tastic Vent Roof Vent Assembly Upgrade # FV807357 which would replace what you have with the current Fan-Tastic powered lift setup with a fan.
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  • Replacement Thermostat-Regulated Ceiling Vent for 2005 Holiday Rambler Presidential
    For your Ventline Northern Breeze vent fan with thermostat, we don't have a wiring diagram or any parts. However, if you are looking for something similar to replace it, we do have the Fan-Tastic Vent Roof Vent w/ 12V Fan and Thermostat - Powered Lift - 14-1/4" x 14-1/4" # FV803350. We also have the Fan-Tastic Vent Roof Vent w/ 12V Fan and Remote - Powered Lift - 14-1/4" x 14-1/4" # FV807350 that has 13 automatic, thermostat-regulated settings to conserve energy.
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  • Availability of Fan-Tastic Roof Vent with Rain Sensor to Close Lid
    We have a very similar Fan-Tastic roof vent to the # FV801250 that does have a rain sensor, but this one does not. Since this is a manual lift lid there'd be no way to automatically close the lid if rain was sensed. So instead you'd want the part # FV803350. This has a powered lid lift that when the sensor gets wet will automatically close the lid.
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  • Is There a Direct Replacement Option for Fan-Tastic Vent Roof Vent 4175
    The newer Fan-Tastic Vent Roof Vent Fans like part # FV803350 and part # FV807350 all install pretty much the same way, power and ground wires going into the fan and then either built-in controls or a wireless remote to control it. They don't use a typical wired wall mounted switch. Therefore, none of them are going to be a direct replacement in that sense but you're literally just taking the power and ground wires going to the old fan and hooking them up to the new, the other wires and...
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  • Solution for Fan-Tastic Roof Vent that Runs Constantly When Fuse is Installed
    Sounds like there's an internal issue with the Fan-Tastic roof vent you have. Most likely a circuit board issue. With the Fan-Tastic roof vents there isn't a replacement circuit board available but you can replace the "guts" of the vent with the # FV803358 which does take care of the circuit boards and lift/fan motors. This would be best solution to get your roof vent working again. I attached a review video for more info on this as well.
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  • Fan-Tastic Vent Rain Sensor Light Stays On All the Time
    The rain sensor doesn't have to be activated. When it gets wet it will automatically close the vent lid. When it dries it opens back up. But it sounds like yours has a short that is causing that light to stay on all the time. In order to get the replacement rain sensor you would need upgrade kit # FV803358 which includes the sensor.
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  • Recommended Replacement For An Older Model Fan-Tastic Vent RV Vent
    The model Fan-Tastic fan you have with the wall mount is discontinued so the only option is to replace the fan and remove the wall mounted thermostats. You can replace the vents with the Fan-Tastic Vent Roof Vent w/ 12V Fan and Remote # FV807350 which comes with a remote to control the fans instead of the wall mounted control. This thermostat-controlled roof vent with 26 settings has a rain sensor so that the dome automatically closes and the built-in reversible, 12V fan shuts off if rain...
    view full answer...

Do you have a question about this RV Vents and Fan?

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Kathleen M
Updated by:
Kathleen M
Employee Leah S
Updated by:
Leah S
Employee Shelly K
Updated by:
Shelly K
Employee Wilson B
Updated by:
Wilson B
Employee Adam Y
Updated by:
Adam Y
Employee Kim H
Updated by:
Kim H
Employee Cole B
Installed by:
Cole B
Employee Lisa S
Written by:
Lisa S

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