Floor Vent

Floor Vent


Adequate ventilation is crucial to control temperature, humidity level and to evacuate smells from cooking; that’s why we installed a Roof Fan (faroutride.com/fan-installation/). The job of the roof fan is to take air from inside the van and pull it outside the van. The evacuated air needs to be replaced with fresh air or the roof fan won’t be able to do it’s job! If the fan is located in the rear of the van, the front windows could be used as air intake. If, like us, the roof fan is install in the front of the van, there should be some intake somewhere in towards the rear of the van. Here is our approach on that matter:

1- Add an air intake under the fridge, so the fresh air helps reduce the workload of the fridge (and save on electricity). This is covered in this article:



2- Add an air intake at the back of the van to cool down our bedroom. This is covered in this article, keep reading!!



We installed a duct from the floor vent to above the bed, because we realized that fresh air would not come up above the bed; it was really hot up there! The duct is attached with velcro straps so it can be easily detached, extended and located almost anywhere on the bed; it’s a cool feature when we’re reading or just chilling on the bed!

Floor Vent, Duct (3)
The black thing on the left is a 3-axis mounted fan, we highly recommend it! Buy on Amazon.



Before you go ahead with the floor vent, please read our “On Second Thought” at the end of this page!





TOTAL COST : $80 USD without fan, $130 USD with fan.


DISCLOSURE: This post contains affiliate links, which means that if you click a product link and buy anything from the merchant (Amazon, eBay, etc), we will receive a commission fee. The price you pay remains the same, affiliate link or not.







*Disclosure on the fan: This is a bilge air blower fan. It’s designed to push A LOT OF AIR for engine compartment of boats. It’s VERY NOISY and draw a lot of current (6.5A at max speed, but it’s similar to a computer fan at low speed ). If you choose to install it, be aware that it’s too loud to be run at night and make sure to install a Speed Controller because it will only run at full-speed (like, crazy-supra fast). We think it’s not mandatory to install the fan, but it’s kind of nice to have when it’s really hot.







Let’s first make a hole in the floor. We don’t mind making hole in the van anymore, we’re getting used to it! 🙂

HINT: Start with a small pilot hole (like 1/8″ or such), so if you’re slightly offset (go look under the van to confirm the hole location) you can start over; the 4″ hole will “swallow” your first miss located pilot hole…


Drilling into the van metal floor exposed edges to corrosion, so as usual we sanded the bare edges and applied primer + paint + clearcoat. We sourced them from our local Auto Parts Store (It’s better to use a can. Spray it into a jar and use a Q-Tip to paint the edges).

Floor Vent, Paint


The Valterra Slip Hub (3″) will be installed under the van. But first, let’s get rid of the small flange; it’s useless to us (and will prevent us from installing a mosquito screen):

Floor Vent, Cut Flush


There is also an “inside flange” (for a lack of better term) that we can trim away; trimming it will increase inner diameter = more air flow!



The Valterra Slip Hub is installed under the van. Notice the small, white, no-see-um mosquito net sandwiched between the wire mesh and the slip hub! (we will install a dust filter a bit later)
Floor Vent, Valterra Installation


This is looking from inside:

Floor Vent looking from inside


We want the floor-vent to be easy to close/open, so we’re adding a Blast Gate Valve.

It will be stuck to the floor with 3M VHB Tape (and act as a sealant against water spill). The Blast Gate’s flange that is inserted inside the floor hole is a bit too long, so we trimmed it away:



Then the Blast Gate is just pressed against the floor to secure it in place:

(the following pictures were taken once the van was completed…):

Context: The grey thing on the right of the gate is a torque wrench; the wood platform above is to support a toolbox. On the very right is the slide-out-bike-tray.



A duct will run from the floor hole to above our bed, so we drilled a 4″ hole in the platform bed and inserted a 4″ splice:

Floor Vent, Splice 1

Floor Vent, Splice 2


We then attached (with Powertec hose clamps) the in-line fan and the duct from the floor vent to the bed platform (if you chose not to install a fan, well, don’t install a fan just route the duct):

Floor Vent, Duct (9)

The duct is held on the wall with plastic coated hanger straps.


Then we attached the top duct with D-Ring picture hangers (Buy on Amazon) and velcro straps (Buy on Amazon). We located the fan speed controller so we can access it from the bed or from the back of the van:




We added a dust filter, because we learned the hard way that dust will get sucked in on dusty roads… The filter just holds with the mesh screen sharp ends:

Floor Vent, Dust Filter
This picture sucks and the filter should be cleaned… we’ll clean it we promise!



That’s it!

Stay Cool!





September 2018 Update

So we just went through a summer and it was a HOT one! Here are our thoughts:

PROS: The floor vent is great for when we leave the van alone (in the city or when riding or bikes); indeed it’s super safe, there’s no potential for thief through that, nice. If we had a window instead of the floor vent, we’re not sure if we could leave it opened in urban areas…

CONS: It’s not much effective as passive vent because the hole doesn’t have enough surface area. When it’s super hot outside, we wish was had a slider window in the back to get more ventilation without having to start the inline fan (as we mention the inline fan is a little noisy). We consider adding a window in the back for next summer.

DUST: The floor vent located at the back of the van collects a lot of dust! We need to clean our dust filter quite often. However the fridge floor vent is not that bad since it’s located near the front.

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About us



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. Every day is an opportunity for a new adventure... We’re chasing our dreams, and hopefully it inspires others to do the same!

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Thanks to all of you, we managed to negociate group discount on these. Strength in numbers!

11 thoughts on “Floor Vent”

  1. First, thanks for everything, I wish you two all good things.
    How did you attach the Slip Hub, I see what looks like 4 bolt heads
    which leads me to think they go all the way through to inside ?
    Could you use just sheet metal screws ? Thanks again.

  2. Highly recommend just buying a zero breeze mark 2 portable air conditioner. They’re expensive, but only consume 250 watts, can tuck away easy, and work great for cooling the van down fast without having a roof mounted ac that sucks up a ton of battery.

  3. Bonjour à vous deux;
    Votre site est extraordinaire, phénoménal. Je continue à le découvrir au fil des mes lectures et je suis remplis d’admiration.
    Je comprend que la ventilation est primordiale. Malgré les difficultés rencontrées, feriez vous encore le choix de ventiler le réfrigérateur et, en partie, l’habitacle par le plancher ou installeriez vous un Maxfan supplémentaire ?

  4. Hi thank you for all your info, your website has definitely been helping me out in my design process so far! I was thinking of doing one side window in the back by my platform bed with a fan in the front of the van where my kitchen and wood burner would be. If you had installed the window in the back do you think you would still use the floor vent as often? I liked the idea of not having the window open if I am in a more urban area, but am worried about the noise as I was thinking the floor vent might be a good idea for when I’m sleeping. I also loved the idea of the fridge vent, but was thinking of having my fridge at the top of my kitchen countertop (cut a hole in the counter top so I can remove a piece of wood and have access to the fridge). It seems I would want to try to vent this out even more since the hot air would rise and make it less efficient. Would you recommend a similar duct as your floor vent through the cabinet to the bottom of the vent? Thanks!

  5. Sir, you mentioned to add a slider window at the back, I was wondering, would another maxxfan at the back be better? I am considering this design, please share with me your thoughts.

    Thanks loads!

  6. I stayed pretty comfortable sleeping in the summer with a rear-mounted ceiling fan/vent (blowing downwards), with the front windows cracked two inches. Difficult to keep van cool and secure in urban areas while you’re gone during the day. Doing it again, I’d do two rear side-mounted windows with a mid-mounted ceiling fan/vent (like yours). And maybe a larger (non-powered) floor vent towards the front, like 8 inches wide.

    Fun side point – I ran the Fantastic fan all the time during light rain and moderate speeds (up to around 45mph). It was fine!


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