Photo 1 of Aerostar 20x20x4 Slim (19 1/2" x 19 1/2" x 3 3/4") MERV 11, Allergen Protection Air Filter, 20x20x4 Slim, Box of 3, USA

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Photo 1 of Aerostar 20x20x4 Slim (19 1/2" x 19 1/2" x 3 3/4") MERV 11, Allergen Protection Air Filter, 20x20x4 Slim, Box of 3, USA Photo 2 of Aerostar 20x20x4 Slim (19 1/2" x 19 1/2" x 3 3/4") MERV 11, Allergen Protection Air Filter, 20x20x4 Slim, Box of 3, USA Photo 3 of Aerostar 20x20x4 Slim (19 1/2" x 19 1/2" x 3 3/4") MERV 11, Allergen Protection Air Filter, 20x20x4 Slim, Box of 3, USA Photo 4 of Aerostar 20x20x4 Slim (19 1/2" x 19 1/2" x 3 3/4") MERV 11, Allergen Protection Air Filter, 20x20x4 Slim, Box of 3, USA