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Memphis, TN | I'll see if I can get some photos posted. It is ridiculously simple, Just a 20x20 box fan with 2 thin aluminum angles riveted to each side to form a channel for a 20x20X 1 furnace filter to slide down into on the back of the fan, The fan I used has legs on that captures the bottom of the filter. It recirculates the room air through the filter. My office is 18x24. I let it run constantly on low in the center of the office. I expected the fan to run maybe a year and it's still going. (automatic jinx!) It isn't in a window, it recirculates the inside air, I use a good hepa filter. I occasionally blow it out a couple of times and change it when I think about it (like now).It's not my idea, I saw an online study and decided to give it a try. It works extremely well for me. | |
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Air filter for shop office