I currently have a spray “booth” set up in my garage that consists of 2×2 framing wrapped in poly. It measures 7′ x 7′ x 5′ wide. Currently there is a box fan (not explosion-proof) set up at the exhaust end of the booth which creates negative air and pulls fresh air in from the filter at the top rear of the booth. What I’m wondering, after reading a lot of articles of explosion proof fans, is if I should put the fan on the air intake side so that it creates positive pressure therefore reducing the risk of an explosion. I am using Target EMTech 6000 waterbased lacquer to finish an electric guitar, intending to spray 4-6 coats a day with 1 hour between. I don’t anticipate there to be a high volume of overspray in the booth, but am still concerned about the potential for an explosion should the spray get into the fan.
Looking for anyone’s thoughts on negative vs. positive pressure.
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Spray booth
To minimize overspray in your garage you need the fan at exit for negative pressure so all leaks are sucking in, not pushing vapor out. You must check the MSDS for your paint to check volatility. Don't forget that ANY switch, motor, etc. can ignite vapors so they must be out of the booth if volatile.
Forrest
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