180 CFM...good enough???

I am beh8ind on this post but i believe 180 would be fine I just built another paintbooth last week using a range hood. I think it works real well. My first one i built i used a exhaust fan for bathrooms

Good info all around on this subject. I used the calculations on the website listed and came up with the following:
14.5 inches high X 22.5 inches wide...divided each by 12 to get:
1.208' X 1.875' X 100 = 226.5 CFM
the (100 is FPM for cross draft venting since that is what Im planning)
That's with 0.0 SP (static pressure)...now I noticed Grainger has a 265 CFM @ 0.0SP Shaded Pole Blower.
I figure after adding the ducting I will need (which won't be much) I should be at around 0.1 or 0.2 SP...by the way this is just a guess I didn't actually do the calculation for static pressure. This will leave me with about 230 - 250 CFM which is plenty.

just thought I would share my findings. Thanks again for your help....oh yeah if my math is wrong let me know.

Hi jmixon,
I built a spray booth with the dimensions, 28w x 24d x 18h. I used 1/4 plywood for the sides, 1/2 plywood for the bottom and back and 3/16 clear acrylic for the top. I first used about a 100CFM bathroom vent blower pulling through a double thickness of furnace filters and blowing about 5 feet to exit the basement. It didn't do a very good job. I had read about someone building one and using a dayton blower with 350 CFM capacity so I spent the money and bought one. It does a great job. I don't think it's too much myself. It's better to have more capacity than not enough. You could restrict the flow if you had to by adding another filter but if you didn't have enough air flow to begin with you wouldn't be able to exhaust the paint fumes completely and you'd be out the cost of the lower capacity blower.
gbritnell

I'm getting an error on that link.....did the user take off all of a sudden, or hit his max?

Thanks! I had just ran across the post that had that link ...very good info. I need to do my homework. Luckly I haven't bought a vent yet!

Thanks again,

Go to this site, you'll get a lot of info and more links.
http://modelpaint.tripod.com/booth2.htm.
The CFM needed is in direct ratio to the size, design and length of duct you're using so it's hard to say if it's good enough.