This is a replacement filter for the April Aire oven filter cartridge. Having had an April Aire filter rack for several years, this expandable filter is easier to install than the old comb filters that required you to insert about 50 comb rods into each filter pleat - a nightmare. This design is just a bad dream. You still have to align the top and bottom in the slide mechanism, and the trick is that you have to insert the top and bottom at the same time - a third hand would be very helpful in this regard, but there's rarely room for two. People in the firebox area, including mines. Anyway, stop complaining, this is a good MERV13 filter, removing all but the smallest particles very effectively. There is also a (less effective) MERV 8 filter - but it's less effective, I tried it and noticed a noticeable increase in the amount of dust in our house. In terms of filtering particles that can transmit viruses, MERV 13 is the best practical choice. When you use this filter, you don't have to add a UV or ionization air purifier that your contractor is trying to sell you - MERV 13 filters remove over 99% of fine dust particles with proven technology, not technology that's yet proven effective Has .
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