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Old February 21st, 2012, 12:55 AM   #2 (permalink)
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Join Date: Feb 2012
Location: San Antonio, Texas
Posts: 79
A positive pressure booth is the best. I own a body shop. I have a spray bake booth and a crossdraft. The spray bake is a positive pressure down draft. It has a slightly higher volume of air being forced in than the volume being sucked out. It allows you to open the entry door without sucking dirt in and if you have gaps like around doors it doesnt allow dirt to suck in. Youll have a hard time pressurizing a room that isnt extremely well sealed up. Just install some intake filters in one wall and install a fan with some exhaust filters on the opposite wall. You dont need a huge draw to move air. Just remember the better the room is sealed up the better movement youll get.
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