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25x20x1 High-Capacity Pleated Air Filter - Green, Koch 102-714-009 | ISC Sales
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Restoration and Abatement - Air Cleaning And Filtration - Air Filters - Pleated Air Filter, 100% Synthetic, 25 in x 20 in x 1 in, MERV 8
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Air Filter 25x20x1 | Wayfair
As wildfire smoke chokes the West Coast, people are making DIY air purifiers. But do they work? | Salon.com
