I am in the process of building my first permanent, dedicated modelling space. I plan a spray booth for airbrushing and have reviewed several articles and Youtubes. Many posts call for moving 200 cfm. I was hoping to use a bathroom exhaust fan venting directly through a wall (less than a foot of hose and one 90 bend). An 80 cfm unit should refresh the entire volume of my booth every 3 to 4 seconds. Am I misguided to think that this should be adequate ventilation? The difference in cost is significant and I also don't want to suck all the heat out of my house. Any experience with this out there?

BGC

hello
I am planning on getting a spray both myself. I have never had one before in my model space in the cold basement.

as far at the CFM goes, I do not think 80 CFM will do what you think and adding the bend is not good at either.

I do testing of package systems in chambers and we use a car electric fan to circulate air when required.

most small electric car fans go up to 250 CFM or more and run on 12 v dc up to 12 amps. the fan is easy to mount and is sealed so chemicals, fumes and moisture will not hurt it. second I use a 40 watt computer power supply to provide the 12 v dc with the correct amperage. computer power supplies of course go to house current of 110 v at 20 amp / 60 hertz. the computer power supply will not work until you short our the two pins on the mother board plug to make the power supply think it is hooked to a mother board, the pins are pointed out in the instructions. this will give you plenty of CFM even with the bend and the fans around me at auto stores I buy the $61.00 after market fans for extra cooling and my local computer store for the power supply is about $38.00. so you around $110.00 you can have a really g0od fan and if you want to add a pot or dimmer switch you can control the speed of the fan. too much CFM can suck the paint away from the model. Now do not forget to get a good filter between the spray both and the fan.

I hope this helps.

May I make a suggestion? I've been using one of these for a year now — seems to do the trick.

Master Airbrush® Brand Portable Hobby Airbrush Spray Booth $79.96 on Amazon.

HTH.

How do you think this would work?:

http://www.ebay.com/itm/NEW-6-Inch-530-CFM-Inline-Duct-Fan-Booster-Vent-Hydroponic-Blower-Exhaust-M-6-/270988054883

Same box here, different brand nme. Works fine

You want to shoot for about 100 fpm at the entry of the booth. That will tell you what cfm fan you want.