Reply by OSU55

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Posted on Spray room ducting question

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1966 posts in 2190 days

#1 posted 08-20-2016 02:38 PM

It will work just fine. I have a similar setup. 8” duct should be large enough. I built a box for the blower (wood frame covered by flat sheet metal), with 2 filters, one on each side, and the box sits in the spray room. Maximize filter area best you can. My “room” is a 10’x10’ 3 wall area in the middle of the garage. I recirculate the air while spraying (use a respirator), then open the back door and garage door to blow everything out after spraying. It it’s good weather, I’ll open the doors a little to let in some cross flow, and I have an 8” duct I connect to the box outlet and stuff under the garage door. I don’t use an inlet filter. I turn the blower on for 30 min or so before spraying. Seems to clean the air well – don’t have much issue with contamination in the finish. Consider some disposable paint booth filters as prefilters. Mine are held in place on the inlet side of the framed filters just by suction. All the filters can be cleaned by tapping the dried finish dust out of them. I haven’t had any issue with finish build up in the blower. I spray mostly WB finish. When spraying shellac I do ventilate while spraying.

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