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Jan 13,  · Measure (or make a cardboard template of) the spacing of your air filter’s hanging bolts, from side to side and front to back. Unfortunately, the mounting eyes on my air filtration unit aren’t even close to matching my joist spacing. But since I have no ceiling, it was easy to add a spanning joist to which I could fasten the hardware. What you want is good air exchange and filtration. Assuming your shop is - say - 14' x 20' x 9' tall you have cubic feet of air. Substitute your own measurements to figure out your cubic footage. Now, using that number look for a unit that can exchange the air several times per hour. Sep 12,  · What size shop air cleaner do I need? We recommend an air cleaner that is capable of filtering the air in your entire shop every ten minutes. To figure the airflow needed for your shop, multiply the length x width x ceiling height. The result is the cubic foot of your shop /5.
What you want is good air exchange and filtration. Assuming your shop is - say - 14' x 20' x 9' tall you have cubic feet of air. Substitute your own measurements to figure out your cubic footage. Now, using that number look for a unit that can exchange the air several times per hour. I used a standard furnace filter as my pre-filter - about 89¢ at hardware stores and went to my HVAC contractor to purchase a particulate filter, good down to 5 microns, for $ I clean them both at about the ratio of 6 to 1 respectively. When cleaning the pre-filter lay it flat on a piece of plywood then hit it with the flat of your hands. Sep 04,  · The shop is about 15' x 15' (maybe 20 x 20). It's laid out more or less like this (not to scale): I need to figure out where to put the second air cleaner. Don't assume that the original ("weaker") filter needs to stay where it is.

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