Proper ventilation is an important part of RV living that’s often overlooked. Good ventilation not only contributes to the overall comfort, health, and well-being of RV occupants but also affects the long-term health of the rig itself. In this post, we tell you how both you and your rig can benefit from consistent and adequate ventilation in your RV.
Why Is RV Ventilation So Important?
Maintaining proper ventilation in your RV is beneficial in many ways. More importantly, not properly ventilating your RV can cause significant health and safety issues for the rig’s occupants and for the RV itself. Let’s look at why keeping an RV ventilated properly is so important.
RV Interior Air Quality
You can’t maintain optimal air quality without good RV ventilation. In the confined well-sealed space of an RV, cooking, sleeping, showering, and other daily activities can contribute to a buildup of moisture, odors, and airborne particles. Lack of proper ventilation can contribute to mold and mildew growth, which can compromise the health of the occupants and be damaging to the RV itself.
Proper ventilation helps circulate fresh air, reducing the risk of respiratory issues and the development of mold. This creates a healthier living environment inside the RV and helps preserve the integrity of the rig itself.
Temperature Control
RVs can heat up quickly, especially in warm, sunny climates. Ventilation plays a key role in regulating the interior temperature by allowing hot air to escape and cool air to enter. This not only enhances the comfort of the occupants but also reduces the reliance on air conditioning. That’s especially helpful when boondocking, or camping in any location without electrical hookups.
Moisture Management
We’ve said this many times on this blog, (and mentioned it again in the section on air quality above), but moisture is an enemy to small, enclosed spaces like RVs. Proper ventilation is essential to winning the battle with moisture.
Proper RV ventilation is essential to battle moisture that readily accumulates in RVs. Without proper ventilation, that moisture can turn into mold and mildew, causing health issues for occupants and damage to the rig itself.
Moisture is a common challenge in RVs, particularly in cold or humid climates where condensation can quickly lead to issues with mold and mildew. Ventilation is key to managing moisture by allowing damp air to escape and preventing the buildup of condensation on windows, walls, and ceilings.
Moisture management through proper ventilation is essential for maintaining the long-term structural integrity of the RV and ensuring a dry and comfortable interior.
Odor Control
RV ventilation is especially important in the close quarters of an RV where odors from cooking, pets, trash, laundry, and other sources can quickly overtake the space. Proper ventilation helps to remove stale air and replace it with fresh air so that odors don’t linger. This is especially important for those who spend extended periods in their RV, own pets, or frequently cook inside their rig.
Health and Well-being
Adequate ventilation is crucial for the overall health and well-being of RV occupants. Poor indoor air quality can lead to respiratory issues, make allergies worse, and cause fatigue and other issues. It’s essential to allow fresh air to circulate, promoting good ventilation. All of this contributes to a healthier living environment, making the RV a more pleasant space in which to live.
Safety
Proper ventilation can be a significant safety consideration in RVs. Good airflow helps disperse gases like carbon monoxide that may be produced by appliances like propane stoves or heaters. Adequate airflow is imperative for preventing the buildup of harmful substances and ensuring the safety of everyone inside the RV.
PRO TIP: Here’s a reminder to check your RV propane detector today. While you’re at it, you may want to also check out our posts on what to do if your carbon monoxide detector is beeping as well as RV fire safety.
How to Get Good RV Ventilation
One of the easiest and most effective ways to get good ventilation in an RV is to use your RV roof vent fan. RV roof ventilation is a key way to address the potential issues we noted in the section above.
From improved air quality to temperature and odor control to moisture control, your RV roof vent fan is the star of the show.
Note that roof vent fans in most RVs are a standard size of 14” x 14″. However, if you’re in the market for a new vent fan for your rig, be sure to take a quick measurement to be sure, because some vent fans are 11” x 11”.
PRO TIP: When running your roof vent fan, crack open a window at the far end of the RV to draw fresh air through the length of the rig.
There are a few things to keep in mind where your RV roof ventilation fan is concerned.
Fantastic Fan
Many RVs come standard with one or more roof vents, with or without fans. Our Newmar Mountain Aire came with two Fantastic Fans (in the kitchen & bathroom) that performed really well over our 18 years of full-time living in that motorhome. Amazingly, we never had to replace a single component on either fan over all those years, and they still worked perfectly when we sold it.
These fans have a very low amp draw, are rain sensor-equipped, have a built-in thermostat, and can be controlled by the included remote. The remote controls both the 13 speeds as well as the temperature and can also open and close the lid.
- 14 fixed manual speeds or automatic variable speeds for customizable ventilation; Reversible airflow switch for efficient temperature control
- Built-in rain sensor with automatic open and close function for protection against the elements; manual knob closes the fan in case of emergency
There are other brands on the market to consider, so we wrote about three of the best RV roof vent fans available.
Install a Vent Fan Cover
We did install covers over our rig’s Fantastic Fans because our 2005 Newmar’s fans didn’t come with covers and we wanted to be able to use them in all kinds of weather. If your RV roof ventilation fan doesn’t have a cover, we suggest that you consider doing the same because this will allow you to ventilate your RV even if it’s raining or snowing. You can even drive down the highway with your vent fan wide open and running and not worry about damage.
There are a couple of types of RV roof vent covers on the market, but our favorite is the Camco Aero-Flo because it allows for plenty of venting for high airflow, and offers easy swing-open access for cleaning. (See our post on how to clean an RV vent fan.)
- Offers 30 percent more open vent area than other brands
- Mounting hardware included; Mounts to existing 14” x 14” roof vents
These are available in black or white and are made of UV-resistant resin so they stand up nicely to sun and weather exposure. And again, the entire lid lifts on hinges for easy access to the inside to clean road debris, leaves, etc. from inside the vents should it accumulate (and it will!) over time.
For more information on this DIY project, see our post on how to install an RV roof vent cover.
Maxxair MaxxFan Deluxe 7500K
We didn’t have a Maxxair MaxxFan on either of our motorhomes, but we know lots of people who do… and our new Outdoors RV came with two. Having used them for quite some time now, we have to say we like this fan even better than the Fantastic Fans we had before.
We say this not because it’s necessarily better than Fantastic Fans overall, but because it has a few additional features we like:
- It includes a built-in cover that has a low profile but still offers excellent airflow and weather protection. This means you don’t need to add anything to the fan to be able to use it in virtually all weather conditions.
- It’s thermostatically controlled, allowing you to set a temperature for it to maintain… and the fan will increase/decrease its speed as needed. This is really helpful on days with large temperature swings (like in the desert). When it gets hotter during the day, the fan will speed up to move more air. But, as the sun sets and the outside temps begin to drop, the fan will slow down (or stop!) so it doesn’t get TOO cool inside.
- The fan is reversible, so it can blow air OUT of the RV (like the Fantastic Fans) or INTO the RV. We’ve found this to be really handy on very sunny days… allowing us to use the fan to blow cooler outside air down onto us. Of course, you need to keep the fan screen clean to be sure that when you reverse the flow it doesn’t blow a wad of dust down on you… but we’ve always kept our fan screens clean, so it’s not a problem for us.
- ALL-IN-ONE VENTILATION SOLUTION: The Maxxair Maxxfan Deluxe combines a vent, fan, and vent cover into a single unit, providing a comprehensive...
- POWERFUL 10-SPEED FAN: Experience optimal temperature control with the powerful 10-speed reversible fan equipped with a thermostat. This advanced...
The MaxxFan has an electric lid opening with a remote control and fits all standard 14” x 14” roof openings. The lid can be brought flush with the roof for improved aerodynamics. This fan uses less than 1 amp running at low speed, and just under 5 amps running at the highest speed.
Maxxair Vent Corp 00-06401K Maxxfan DLX
Maxxair makes similar fans with fewer features that are less expensive and have excellent reviews. For example, this Maxxair fan has only 4 speeds, a manual lid opening, and is exhaust-only.
- 12V DC, variable-speed fan has 4 speed options let you increase or reduce airflow, Circulates air li
- Bug screen keeps insects out and is easy to remove for cleaning or maintenance
DampRid
If you’re having moisture problems in your rig or if you don’t happen to have a roof vent fan, you’ll want to open windows for airflow. You may also want to look into a product like DampRid, which helps absorb moisture from cooking, showering, breathing, etc.
- ATTRACTS AND TRAPS EXCESS MOISTURE: DampRid Disposable Moisture Absorber with Activated Charcoal attracts and traps excess moisture, creating fresher,...
- ELIMINATES THE TOUGHEST ODORS: Activated charcoal doesn't just cover up musty odors, it absorbs and removes odors from the toughest sources.
The bottom line is that RV ventilation is important for the health and well-being of RV occupants and helps maintain the structural integrity of an RV over time.
High-quality RV vent fans help remove moisture from the RV and increase airflow. If your RV roof vent fan isn’t working, be sure to put that on the top of your repair list. And feel free to use our easy-to-follow guide on RV roof vent fan replacement.
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Smitty
Monday 8th of December 2025
Good info, as normal:)! We had lots of humidity to deal with in Newport, OR's Pacific Shores. Frequent rain and rolling heavy fogs. We used all the techniques mentioned, and due to power being available, we kept a Davis 1000 Air Dryer on 7/24 too:)! We also had to fight mold growing on our roof top, when we'd stayed at our site for over 4 months during Covid 'pod's' time:)! (Washing with Dawn and a soft brush, kept it from becoming an issue.)
In our Yuma's inside, but non air condition storage, we had to add humidity:)! Temps in the summer months could reach 120F. So we'd add a splash of RV Seal Conditioner into the toilet, and sink P traps. And a 'Just Do It' Orange bucket in the shower with about 2 1/2 gallons of water.
You two keep them coming. Always appreciate you sharing your knowledge:)! Have good Holidays ahead! Smitty
TERESA
Monday 8th of December 2025
Having a motorhome that is all electric, I haven't noticed any moisture buildup inside when cooking or heating. I used to have a travel trailer and in the cold mornings I would notice a lot of moisture on the windows. I don't notice it now. I do have two dehumidifiers running when I have it parked for the winter next to our house, along with an electric heater inside keeping it warm.
Glenn
Monday 8th of December 2025
I use a small dehumidifier inside. Empty it about every three days. Seems to work great.
Lothar Eckardt
Monday 9th of December 2024
Love your articles and tips. Any suggestions on ventilation during storage?
TheRVgeeks
Monday 9th of December 2024
Hi Lothar. That can depend on where & how you're storing your RV (i.e. is it enclosed? covered? hooked to power?), so it's hard to give a single answer. It can also depend on your ultimate goal (avoiding moisture buildup/damage, preventing odors when taking it out of storage, etc). Opening anything up to allow for ventilation during longterm storage can also allow things in your don't want. When we've stored our RV (including currently storing our new travel trailer for the winter), we've left everything closed up and fans turned off so that we could shut down all power and not worry. If we're storing in conditions where moisture/humidity/condensation could be an issue, we leave one or two Damp Rid cannisters inside the RV... and check on them once every month or two to make sure the Damp Rid granules don't need to be replaced).
Laila
Wednesday 13th of December 2023
We live in the pacific NW where it's rainy and cold all winter. Our Class C is stored outside. We run the heat at a low setting and a dehumidifier as well. Should we still open the roof vent or a window when it's cold and rainy and the unit is being stored? Thanks,
TheRVgeeks
Wednesday 13th of December 2023
Hi Laila! It sounds like you're already doing a great job, and exactly the right thing... heat on low and a dehumidifier. Since your rig is in storage, no one is living on board — so no showering, washing dishes, or breathing. So the main sources of humidity aren't happening, and you should be fine leaving your vents and window closed up tight without a problem.