Installing a Vent Fan on Our High Top Conversion Van

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Installing a Vent Fan on Our High Top Conversion Van

Installing Fan-tastic vent fan in van

This post may contain affiliate links. Learn more >>

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The next step in our van build was installing a roof vent exhaust fan, which means cutting a hole in the roof. Fun!

A vent fan is an essential part of creating a comfortable living environment inside of a van. It keeps the van cool by sucking out hot air and creating airflow, and it also vents the living space when you’re cooking.

The vent fan was one of the first van components that we purchased, and installing it turned out to be easier than we thought.

What We Went With: Fan-Tastic Vent 7350

Fan-Tastic Vent RV Roof Vent with Thermostat and Rain Sensor, Manual and Automatic Speeds 12 Volt RV Vent Fan, Smoke Dome RV Vent Cover - Model 7350 - White

The fan we chose is the Fan-Tastic Vent Model 7350. This fan is top-of-the-line with efficient power draw, 14 speeds, a remote control, a thermostat, reversible airflow to pull air into the van, and a rain sensor that automatically closes the lid if it’s raining.

If you don’t need all these features, Fan-Tastic has other models down into the $100 range.

MaxxAir also makes the highly-regarded MaxxFan Deluxe that has a built-in rain cover so you can keep the fan running when it’s raining. If you want to do this with a Fan-Tastic, you’ll need to add an aftermarket rain cover.

The Fan-Tastic is capable of pulling in more air than the MaxxFan (920 cubic feet of air per minute for the Fan-Tastic vs 900 for the MaxxFan) and it comes highly recommended by other van-dwellers.

Update: We Now Recommend the Maxxfan Deluxe 5100K

After living in our van full-time and using the Fan-Tastic vent every day, we now recommend getting the Maxxfan Deluxe for your van build. The Maxxfan Deluxe has a built in rain cover, a feature that is vital when you live in a vehicle. Sure, you can add an Ultra-Breeze Vent Cover onto your Fan-Tastic vent, but it’s very bulky and doesn’t look great.

Read our full update on our vent fan situation here.

Note: The installation instructions below will work for any model of vent fan.

Installing the Fan-Tastic Vent Fan

Like when we mounted our solar panels, we had to work around the contoured shape of our high topper.

The big ridge in the middle meant we could only put the fan at the very back of the van where it’s flat, or at the very front of the living space where the ridge is wide enough for the fan. Since we had already mounted a solar panel at the back of the van, the front was the way to go.

The idea of cutting a big hole in our roof was a bit intimidating, but once we got started the install itself was actually pretty easy.

Step 1: Mark the Hole for the Fan

John tracing fan outline_800x500

The first step is to mark where you want your fan. Fan-Tastic apparently includes a template in the box, but we didn’t see it at the time so we used the plastic trim piece to trace the shape onto our van’s roof.

Step 2: Cut the Hole with a Jigsaw


We started by drilling holes at all four corners, then used a jigsaw to connect the dots.

Note: Do yourself a favor and pick up a set of good jigsaw blades. We started off using the included blade on our cheap Ryobi jigsaw. It was slow going and the blade eventually snapped in half. Once we picked up this set of Bosch jigsaw blades we flew through the cuts. With the amount that you use a jigsaw during a van build, it’s worth it to get good blades.

Step 3: Marvel at the Giant Hole in Your Roof

Hole in the roof_800x500

You just cut a big hole in the top of your van. That calls for a victory yawp. But first, better make sure the fan fits!

Measuring installed fan_800x500

Step 4: Attach the Fan to the Roof

Installing Fan_800x500

Fan-Tastic includes sheet metal screws for screwing the fan down, but those don’t hold to fiberglass too well. We decided to use a combination of screws and 3M VHB tape to attach our fan. We lined each side of the hole with VHB Tape, inserted the fan, and popped in the screws around the rim.

Step 5: Seal the Edges with Dicor


We used Dicor self-leveling lap sealant to seal the edges of the fan. This stuff is highly regarded in the RV community, and it really does the trick. We covered the screw holes, the rim and the edges in Dicor, and while it sets it levels itself into a solid waterproof seal. Pretty awesome!

We Have a Fan!

Fan on the van_800x450

That’s all it takes to install a Fan-Tastic fan in a high top conversion van. Now all we have to do is wire it up and we’ll have a cool breeze blowing through our new home. We’ll cover wiring in depth in another post, so stay tuned. Next up is laying down our flooring.

Don’t forget to follow along with us on Instagram @gnomad_home and on Facebook at: Gnomad Home. Thanks again for all the love and support!

Written by

John Serbell

John Serbell

John is the co-founder of Gnomad Home. He researches and writes the in depth guides on our site, and his goal is to make vanlife, alternative living, and dream chasing accessible to all through the democratizing power of free information. He's also passionate about creating, both hands on and digitally - he's the driving force behind our vehicle builds, and he's also in charge of the web design/development around here.

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Why did you go with the Fantastic Fan as opposed to a low-profile rooftop AC unit? I’m trying to decide which way to go, and it seems with this Texas heat if all I have is a vent fan – it’ll just be moving hot air around; where-as an AC unit would provide more comfort . . . what are your thoughts?

JP Carvallo
JP Carvallo

Hey, great job! Quick question: did you have to cut the rim to fit your roof + ceiling width? What order did you do things? It looks you installed the fan by fixing it to the roof (and ceiling) and then went from the inside to install the rim and attach it to the ceiling? Thanks!


Anyone have experience with a cargo van that has a.c. vents going along the roof? How does that impact adding a roof fan?


I’m currently researching vans and really like the Astro van High Top conversions. Do you think I’d be able to install one of these fans on it since the high top is smaller than your full sized high top?

Zach T

How much of a curve is there in your roof where the fan was installed? Did the fan rim have to flex at all when screwing it down? There is a pretty good curve in my roof where I want to install my fan and I am not sure how to go about it. Any suggestions?

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