21" x 23 1/2" x 1" MERV 6 - Premium Fiberglass Air Filter - 6 Pack MERV 6 - Fiberglass Air Filter:21" x 23 1/2" x 1" MERV 6 - Fiberglass Air Filter 18 1/2" x 19 1/2"

18 1/2" x 19 1/2" x 1" MERV 8 - Premium Pleated Air Filter - 6 Pack

23 1/2" x 29" x 1" MERV 6 - Fiberglass Air Filter - 6 Pack

20" x 21 1/2" x 1" MERV 13 - Pleated Air Filter - 6 Pack

19 5/8" x 21 1/2" x 1" MERV 11 - Pleated Air Filter - 6 Pack

20" x 24" x 2" MERV 8 - Premium Pleated Air Filter - 6 Pack

21" x 23 1/2" x 1" MERV 6 - Premium Fiberglass Air Filter - 6 Pack MERV 6 - Fiberglass Air Filter:21" x 23 1/2" x 1" MERV 6 - Fiberglass Air Filter 18 1/2" x 19 1/2"21" x 23 1 2" x 1" MERV 6 Fiberglass Air Filter 6 Pack Actual Dimensions: 21" x 23 1 2" x 3 4" This filter is constructed using a MERV 6, fiberglass media with a downstream scrim and encased in the same partially recycled cardboard frame as pleated air filters. Unlike disposable filters made with sharp metal, these will not cut your hands and feature a low pressure drop and high level of filtration. Each filter lasts up to 1 month and should be