Reply by SST

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Posted on Spray Booth

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790 posts in 4218 days

#1 posted 05-16-2007 12:56 AM

You might want to check with a local furnace contractor in your area. I used a furnace blower motor and “squirrel cage” fan out of a furnace that was replaced with a newer one by the contractor. They often just toss them, and you can get one for nothing. I put it in a box as an air filtration system. (See my projects for pics). I think this concept might adapt well as an exhaust system as it can move a lot of air quietly.
Having some experience in the auto painting industry, I’ve learned a couple of things about spray booths: First, if you’re spraying solvent based finishes (flammable), it’s a good idea to shield your fan motor from the exhaust flow, only the fan part should be in the duct, and second, it’s a good idea to spray your fan blades with Pam or some other cooking spray to keep paint/varnish residue from building up on the blades. Also, it’s a good idea to put your filtered air inlet up high, and have your exhaust outlet low to create a down draft effect. It keeps the floor dust & dirt down low. Air flow should not be excessive, you don’t want a windy booth. Lighting & other electrical stuff should be shielded.
The goal is to have a nice finished product without exploding.

-- Accuracy is not in your power tool, it's in you

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