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Good thought Jim, but there are a couple of problems with the "in blowing". The main fear is the accumulation of vapors and atomized paint inside the booth creating vortices. It is absolutely imperative that overspray be withdrawn from the field immediately,otherwise it has a tendency to swirl around and over the car, collect any dust or impurities(undercarriages are notorious for dirt!) dry, then settle(or be blown) back on the wet finish.(BIG TIME PITA!) By creating vacuum,instead of pressure,the exchange of air is absolutely continuous,complete, and no "pockets" are created. For breathing & vision-this is a must also. In 25+ years of painting I never have seen a booth with two fans. Are you thinking about a separate heating source? Have used a heated booth,but the elements were built into a one-fan system. The air is filtered twice in pro booths, incoming(the doors are fitted w/fine mesh type) and the receiving end(freeflowing, disposable styrofoam collectors(for EPA regs) I have found that installing any type of filter over (or behind) the fan substantially reduces the air flow. AFA dirt getting in,if all seams are reasonably airtight and wet,there should be minimal dirt entering the system.(of course any dry prep sanding inside will contaminate everything) The ultimate is what's called a "downdraft" booth,where the exhaust ports are actually under the car as it is parked inside. These are VERY nice! Overspray gets sucked right down off of the vehicle(along with any dirt underneath) Dry is even & quick,and leaves a super clean finish.(unfortunately they run about $60-70K to build!) Chuck Salter '66 SB ------------------------------------------------------------------- Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe