Mike was suggesting you push the vapors out. Instead of pulling them out.
Knowing what your products like will help, too. The epoxy I use likes to be vented. So I'll do that while spraying. In fact, I've gotten to where I don't use a fan for epoxy and let the natural breeze do the work for me. I crack the tent flaps at both ends just a little bit. It seems to give the best results.
The single stage I use likes the vapors and off gassing to hang around a bit. So I don't vent for 1/2 an hour or more.
