How to Install a Maxxfan Roof Vent on a DIY Van Conversion

Maxxair Fan Installation

How to Install a Maxxfan Roof Vent on a DIY Van Conversion

Installing a Maxxair Maxxfan Deluxe roof vent on a DIY camper van conversion helps controlling interior temperature, relative humidity (condensation and moisture), indoor air quality and creates air movement. It’s typically one of the first modification performed to the van, so it’s super intimidating… but you are not alone: it’s a rite of passage for all DIYers and we still have to hear about someone who messed it up. With proper planning and extra precautions, you’ll get it right, learn from it and boost your confidence. Below, we fully documented the installation of our Maxxfan to our Ford Transit; hope that guides you in the right direction!

Last Update: March 2020

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Time Spent


Total Cost

$ 0 USD


Maxxfan Deluxe 1 5100K (White lid, manual opening)  Amazon
6200K (Smoke lid, manual opening) Amazon
7000K (White lid, auto opening) Amazon
7500K (Smoke lid, auto opening) Amazon
Roof Vent Adapter 1 Transit Low Roof eBay
Transit Mid/High Roof eBay
Sprinter NCV3 Low/High Roof eBay
ProMaster eBay
Others (Sprinter T1N, Nissan NV, E Series, Transit Connect, etc.) eBay
Roof Vent Backing Frame 1 This goes inside the van eBay
Dicor Self-Leveling Lap Sealant 2 White Amazon
Grey Amazon
3M Window-Weld 1 Fast Urethane Amazon
Butyl Tape 1   Amazon
Machine Screws 16 #10-24 thread, length TBD, Stainless Steel, Round Head Amazon
Nuts 16 #10-24, Stainless Steel Amazon
Washers 16 #10, Stainless Steel Amazon
Primer 1    
Paint 1    
Clear Coat 1    


Item Description Quantity Link
Caulking Gun For 10 oz cartridge 1 Amazon
Jig Saw DEWALT Cordless Lithium-ion 20V 1 Amazon
Blades for Jig Saw Thin Metal Cutting, 5-Pack 1 Amazon
Metal File To break the sharp edges 1 Amazon
Sandpaper Surface preparation before touch-up 1 Amazon
C-Clamp To hold everything in place when drilling 4 Amazon
Duct Tape   Amazon
Painter Tape    1 Amazon
Isopropyl Alcohol    1  


Good To Know

Maxxfan Models

Rain Shield

All the DELUXE models are designed with an integrated rain shield, meaning that the lid can remains opened at all time, even when it rains. Neat! That’s a major advantage over the competitors… Indeed, you’ll want good ventilation during rain episodes.


The 5301K & 6401K Maxxfan models feature only 4 speeds, cannot be run as intake and doesn’t have an “automatic” mode. For these reasons (but mostly because there’s only 4 speeds), we wouldn’t really recommend it.

Electric Lid Opening & Remote

The 7000K & 7500K Maxxfan models feature an electric lid opening & remote (as opposed to the model 5100K & 6200K which must be opened manually and there’s no remote). We personally have the manual lid opening and we’re perfectly fine with it. We chose it because we worried that the electric opening might have a hard time in snow/ice. We also don’t have the remote and we don’t mind it either, because we’re always an arm-length distance from the fan anyway!

White VS Smoke Lid

At last, you have the choice between a white lid, or a smoke (grey) lid… that depends mostly on personal taste and your van’s color!


Maxxfan Power Consumption


Do not use a grinder!

Using a grinder to cut the fan’s hole is pretty bad ass. But all these cool sparks are actually metal chips going all over the place and each one of them is a potential ignition point for rust! These tiny chips stick to the van and it’s just impossible to clean them afterward, so DO NOT USE A GRINDER.

grinder metal chips rust
So cool. So manly. So wrong.

The ideal tool for the job is called a Metal Cutter Shear ( As opposed to a grinder or a jig saw, it does not create any metal chips. Why didn’t we use one then? Because, like most people, we had a jig saw on hand and didn’t want to spend 100$ on a tool we would use only once or twice…

Metal Cutter Shear
A sheet metal shears doesn't create any metal chips, how cool is that!

Where to install: Back or Front?


Most people choose to install their fan in the back of the van, as it creates an air flow that runs through the entire van: air enters by the front door windows and exit by the fan in the back.

We think it’s the ideal location, except if you’re in a similar situation than us (keep reading “FRONT”!).


Because we live full time in our van during skiing season, cooking with the doors open is not an option. Therefore, we installed our roof fan straight above the stove/oven ( That way, the cooking smoke & smell are evacuated immediately.

But there is a drawback: air in the back of the van is not well recycled. To compensate, we should have add a window in the back (


We see many people with 2 fans on their van: one in the front, one in the back. Typically, one fan acts as the intake (OFF) and the other fan acts as the exhaust (ON).

People with this setup are really happy about it, as it creates excellent ventilation. It’s cheaper (and easier) to install a second fan than a window, but the drawback is that it uses more real estate on the roof. If you planned on adding a patio on your roof, that might be an issue.

Adding framing strips or not?

You can order the Roof Vent Adapter with, or without, framing strips (see eBay link under “Material” section above). The framing strips provide additional support to the roof, and are recommended if the fan is installed at a location where the beams are more than 18 inches apart.

In our case, we installed the Maxxfan in the front of the van where the beams are close together, so we didn’t need the framing strips. 



And now let's get to work!

1- Install the painter tape and mark the fan cutout.

To mark the fan cutout, we used the inside of the roof vent adapter.

2- Practice makes perfect…

We “simulated” 2 holes and a straight line to practice drilling & cutting on the panel we were getting rid of. It’s a good thing we did it! We learned that it’s better to make the corner holes a bit outside of the cutting line (the fan flange allow some over cut) AND that a storm of hot-burning metal chips will blow on your face and into your hair. WEAR PROTECTIVE GLASSES AND A SEXY BANDANA ON YOUR HEAD. You’ve been warned.

3- Lion's face: you own the tools, the tools don't own you!

Or: we're scared, but let's pretend we're not.

4- Drill a hole at each corner, large enough to let the jigsaw blade pass through.

5- Cut each side, then apply duct tape to retain the panel from falling at the last cut.

6- Break the sharp edges with a metal file and smooth the edges with a fine sandpaper.

7- Install the roof fan adapter and the fan flange and drill all holes.

We used four C-Clamps to ensure nothing moves during the process.

8- Surface preparation.

- Remove the roof fan adapter and the flange.

- Break the holes sharp edges and smooth with a sanding paper.

- Clean the surfaces to be touched-up with isopropyl alcohol.

9- Apply Primer, Paint & Clearcoat on all the cuts and holes.

This is an important step to avoid corrosion in the future. Indeed, paint plays a much bigger role than just adding color: paint protects metal from rusting. So take note: adding primer + paint + clearcoat should be performed ANY TIME you make a cut or hole in your van. Get used to it!

TIP: All-in-one products don't work well; so primer + paint + clearcoat = 3 different products. Go to an Auto Parts Shop and give them your color code (it's on the driver side door's sticker), make, model & year and they'll prepare paint that matches perfectly the color of your van. Paint in spray can work well, because you can spray what you need in a small plastic container and re-use later (after use, turn the can upside down and spray for a few seconds; this will clear the tube and prevent from drying and clogging).

10- Clean the fan flange with isopropyl alcohol.

11- Clean the van's metal with isopropyl alcohol.

12- Apply butyl tape on the fan flange (on the surface that will be mating with the fan adapter).

13- Apply 3M Window-Weld on the roof fan adapter and the backing frame (on the surfaces that will be mating with the van).

14- Install the roof fan adapter, the fan flange, the backing frame and the hardware.

15- Apply Dicor self-leveling sealant around the periphery of the flange.

While she's working, make yourself useful and start cleaning the work area. Or don't and just be a nuisance by making duck faces for no good reasons.

16- Install the Maxxfan unit through the fan flange and fasten using the 4 provided screws.

17- Look at our fan.

Just look at it.

18- Final Test.

We tested our Maxxfan using the wires from an adjacent light that we removed. (note: we blew a fuse doing the same thing afterward: no surprise, the interior lightning fuse of 7.5 amp located at position F32 is not designed to withstand the load of an additional fan… no big deal, the fuse was replaced and the light is back!) It works!

19- Have a pint of fresh Homebrewed Session I.P.A.

Well deserved!

On Second Thought...

We've been using our Maxxfan since 2016 and it does exactly what it's suppose to: it's powerful, doesn't draw too much power and being able to run it when it rains is SO IMPORTANT. If we had to start over, we would definitely install the Maxxfan again!

Maxxfan Review


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about us

Nice To Meet You.

Hello! We’re Isabelle and Antoine 🙂 In 2017 we sold our house (and everything in it), quit our engineering careers and moved into our self built campervan. We’ve been on the road since then and every day is an opportunity for a new adventure; we’re chasing our dreams and hopefully it inspires others to do the same!

96 thoughts on “How to Install a Maxxfan Roof Vent on a DIY Van Conversion”

  1. Would you address the pros and cons of the Maxxair Fan vs a rooftop AC unit? Could an AC unit replace the maxxfan? Seems if the AC unit could do what the maxxfan does AND be an AC when needed, it would be a bonus, especially when traveling is southern climates.

    • I’m no AC expert, but I believe that AC units cannot act as a fan (exchange air between inside/outside), and that’s why RV have BOTH fans and AC. Fans are still required to exhaust moisture and to evacuate “polluted” air from inside.

  2. Thanks for this detailed post (and entire website!) I’m curious why are the roof vent adapter and backing frames absolutely necessary ? I looks like it ads a bit of height to the fan installation. I though the butyl tape would fill the groves of the roof. Does maxx fan not come with everything necessary to be installed directly on the metal ? (I installed fantastic in my old van and it came with an adapter sleeve thingy) Thanks for your answer !

    • You can fill the outside groove with butyl tape, but the adapter makes it much easier and reduce the risk of leaks in my opinion. On the interior side (inside the van), the surface is relatively flat so you can buy the backing frame OR you can make your own backing frame with wood or similar…

      Good luck!

  3. I have seen on other websites that the fan needs to be wired to the 12V aux source (cigarette lighter) in the van. But on your website you connected the fan to the wire for the lights and upsizing the fuse. What are the drawbacks for this connection? Have you had any issues?

  4. I’m gonna mount max fan soon and wanted to know if having the backing adapter is needed. Was thinking of not adding one and if I do was gonna use flat aluminum

  5. Hi
    Question regarding the #10 screws. I appreciate going with Stainless and using locking nuts and washers. My question is regarding #10s. My Maxxfan came with #8s. Did you size up for a reason or was your fan’s flange cut with #10 sized holes?


  6. Hey! thank you guys for all the good information!
    Question about wiring the fan: the wire on the fan is 14 gauge and for my run i am going to use 12 gauge.
    What is the best way to make this connection? Use 14 gauge quick disconnects for all connections and just stuff the 12 gauge wire in there?
    thanks for your advice


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