My girl and I are in the process of building a new house. I'm in the enviable position of having the ability to design my workshop room (that's right... IN the house!) from the ground up.

One of the ideas I want to work on is how to build a spray booth with the motor on the outside of the house, and the vent built into the wall. Not hacky window workarounds, and no loud fan noise inside the house.

But if I'm going to build in a fan, I want it to be a pretty strong one. Any suggestions/recommendations/articles you can suggest on how to best pull this off?

Thanks!

You might want to look at fans for laboratory fume hood ventilation; those are designed for high flow to ensure that the airflow is one way away from the user. With ratings of up to 1600 cfm (cubic feet per minute), you should be able to get as powerful an exhaust as you want.

You will probably be able to find something similar or close to, at home depot/lowes, etc.
My grandparents cabin has a sauna in the cabin itself, and due to a fire, they had to find a way to exhaust heat if it got too hot, so they installed an exhaust fan in the cabin. When that thing starts up, it really goes! It is not your average bathroom fan, or even close. So, you could check out something like that to see what kind of exhaust options the home improvement places have. you might be able to go with a couple exhausts if you are afraid one wont be enough.

if you want a good fan every industrial fan can be good,like the one used in restaurant kitchens

The shape of the spray booth also plays a roll. Just a fan on the wall will vent the room but expect to smell the paint for a while. If the walls of the booth are shaped correctly, it will keep air moving to the fan and not drift back into the room for a while. Plan on adding a dryer vent or two from outside to allow for return air into the room. That will help keep the air flowing out through the exhaust.
Think of it like the central heating in the house. If the door to the room is closed and the door fits close to the floor then the airflow from the incoming air vent through the room is poor and the difference in temp is noticeable. If you open the door the airflow increases and the temp balances with the rest of the house.

I think the main issue would be to find an extractor/fan with high CFM that is affordable. High quiet air flow = $$$

Also if you're going to DIY, you need to get a grasp on Static Pressure, CFM, make-up air, etc...

Figure out the size of the room first. Get cfm accordingly.

I have built professional venting systems for prop and model work. If you are venting enamels, lacquers or even Tamiya sprayed with alcohol get a fan with the motor outside of the airstream."Squirrel cage" blowers are really good.Remember also the bigger the fan, the bigger the noise.

Doesn't the air entering a squirrel cage fan, flow around the motor?(Directly in the incoming airflow)

Some do, some don't.

What I'd do is take a tool cabinet design and mod it for a fan setup. Lots of plans out there.

Not all.




This one does.

Please consider your lighting needs, LED'S ARE high efficiency, low heat, & glass/perspex sides, top & hinged front would be helpful.

In the US, furnace filters are cheap & readily available, so consider how you will fit & change them.

Think about your intended largest model, eg A 1:32 HK B17 or Lancaster will need a lot bigger booth than a 1:72 tank, so go for at least twice the size you think you need


Good luck, please post your progress, & sounds like you got a keeper!

The larger the spray booth the greater the CFM flow to evacuate the air. I think bathroom fans are near 100 CFM.

the fan is going outside !make sure its weatherproof and above the maximum snowfall height ( if you get snow)