[azoldbill]

OK, searched, and came up with the magic number of 100cfm per foot of opening when designing a spray booth. I just happen to have an old blower that is rated at 250cfm. The question here is this.....WHAT is considered the "opening"?

a) Where the filter is (say, 10"x20"=120", just under 1 square foot)

OR

b) is it the actual opening of the front of the booth itself?

Just want to know if what I have is enough or if I need to do some more scrounging.

Thanks!