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Filtrete 13.5-in W x 21.5-in L x 1-in MERV 5 Basic Pleated Air Filter in the Air Filters department at Lowes.com
![Koch 13 x 21 1/2 x 1 MERV 8 Pleated Air Filter 12 Pack - Hepa Filter Sales - HepaFilterSales.com -- We Deliver Breathing Easier Koch 13 x 21 1/2 x 1 MERV 8 Pleated Air Filter 12 Pack - Hepa Filter Sales - HepaFilterSales.com -- We Deliver Breathing Easier](https://hepafiltersales.com/cdn/shop/products/P8S1-130-214-Single_600x.jpg?v=1670096657)
Koch 13 x 21 1/2 x 1 MERV 8 Pleated Air Filter 12 Pack - Hepa Filter Sales - HepaFilterSales.com -- We Deliver Breathing Easier
![13 x 21-1/2 x 1 MERV 11 ( MPR 1000, FPR 7-8 ) Pleated 1" Air Filters for AC and Furnace. 4 PACK. Exact Size: 13 x 21-1/2 x 3/4 - Walmart.com 13 x 21-1/2 x 1 MERV 11 ( MPR 1000, FPR 7-8 ) Pleated 1" Air Filters for AC and Furnace. 4 PACK. Exact Size: 13 x 21-1/2 x 3/4 - Walmart.com](https://i5.walmartimages.com/asr/db2f8e66-8cdf-4e81-95e8-26dd87abff56.e559f3cbc4cfafd7d0719ed902a386e8.jpeg?odnHeight=768&odnWidth=768&odnBg=FFFFFF)
13 x 21-1/2 x 1 MERV 11 ( MPR 1000, FPR 7-8 ) Pleated 1" Air Filters for AC and Furnace. 4 PACK. Exact Size: 13 x 21-1/2 x 3/4 - Walmart.com
![Aerostar 20x21 1/2x1 MERV 13, Pleated Air Filter, 20 x 21 1/2 x 1, Box of 6, Made in the USA - Amazon.com Aerostar 20x21 1/2x1 MERV 13, Pleated Air Filter, 20 x 21 1/2 x 1, Box of 6, Made in the USA - Amazon.com](https://m.media-amazon.com/images/I/51+4HyUS-TL._AC_.jpg)
Aerostar 20x21 1/2x1 MERV 13, Pleated Air Filter, 20 x 21 1/2 x 1, Box of 6, Made in the USA - Amazon.com
![16 3/8x21 1/2x1, Actual Size: 16 3/8"x21 1/2"x3/4", Carrier Replacement Filter by Aerostar - MERV 13, Box of 6 - Walmart.com 16 3/8x21 1/2x1, Actual Size: 16 3/8"x21 1/2"x3/4", Carrier Replacement Filter by Aerostar - MERV 13, Box of 6 - Walmart.com](https://i5.walmartimages.com/seo/16-3-8x21-1-2x1-Actual-Size-16-3-8-x21-1-2-x3-4-Carrier-Replacement-Filter-by-Aerostar-MERV-13-Box-of-6_31c9f136-6f02-4ab7-96da-5a540fd0bbec_1.15489bd9e299fe269456478dd356c7b8.jpeg?odnHeight=768&odnWidth=768&odnBg=FFFFFF)
16 3/8x21 1/2x1, Actual Size: 16 3/8"x21 1/2"x3/4", Carrier Replacement Filter by Aerostar - MERV 13, Box of 6 - Walmart.com
![Aerostar 13x21 1/2x1 MERV 8, Pleated Air Filter, 13 x 21 1/2 x 1, Box of 4, Made in The USA - Amazon.com Aerostar 13x21 1/2x1 MERV 8, Pleated Air Filter, 13 x 21 1/2 x 1, Box of 4, Made in The USA - Amazon.com](https://m.media-amazon.com/images/I/81ghs7PkACL.jpg)