just setting up the finish room, and here’s what I know (which is very little BTW) – My room is ~10′ x10′ x 9′. I know I need an exhaust fan, and a filtered intake fan. I do plan to spray laquers and such, so plan to get a explosion proof exhaust fan, and am told that I should shoot for a minimum CFM of ~1800 in order to change the air twice/minute. I plan to route that thru an opened 32″ window, and I will build som,e sort of stand that holds in the windowsill while also ensuring minimal leaks.
Wondering about best source to obtain a fan like this? Ideas??
Also, the intake fan has me bewildered. I’ve never worked with AC ducting… so not sure how to hook that up so that it filters the makeup air as it routes it into the finish room? The air is coming thru an interior wall that I have ready to punch out as needed, and that room will have plenty of makeup air as well, so not an issue there.
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I'm not an expert on the subject but, a question comes to mind as to why you need an intake fan? Why not just put a filter in the opening that will be the intake and let the exhaust fan draw makeup air through that? I'm sure size and restriction calculations will be needed.
Great question and ty for qwk reply!!! I am told that I do, maybe I don't? But I partly want one to enable the positive pressure I mentioned, to help keep the finish room dust free. Otherwise, it may not be needed. But since the exhaust fan needs to be the explosion proof kind, and thus is the expensive one, I would like to add the intake fan as well, since at a minimum added expense of maybe 1-3 hundred $, I get the bonus of the positive pressure option.
I would just use the explosion proof fan as an exhaust fan, and skip the intake fan. Instead I would facilitate passive air return. All it would take is an opening in a door or wall, sized to fit a replaceable furnace filter. The powerful exhaust fan will pull air through the filter, and constantly replace the fresh air.
Since you'd be pulling intake air from an adjacent interior space, all you need is a cheap furnace filter. You just don't want to pull dust and particles in from the next room, but the furnace filter takes care of that issue.
Good luck with it.
Another question: Why are you pulling makeup air from interior space? Is this living space? If so, you are paying to condition it. Why turn around and blow it back outside? Just put another opening through an outside wall, put a filter in it, and let your exhaust fan pull make up air from the outside.
As I said, I'm no expert. Hence, I don't understand the "positive pressure". Seems to me , if your finish room shares walls with your living space, you would want negative pressure to prevent odors, dust, etc. from infiltrating into the living space.
I really thank all for input!! But I realize I wasn’t real clear. This is a detached shop. No living space. I will so infrequently use the finish room I don’t care about eating a little But if conditioned air. I’m really wanting the positive pressure so that air flows FROM the finish room when I want it to, which is solely when I enter and leave. That way no dust enters. Once I’m in the room, the exhaust fan will go on which will just evacuate the rooms odors/fumes.
What I really am hoping for is input on how to setup a filtered intake fan. Ty so much
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