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21" x 21" x 4" MERV 11 - Pleated Air Filter - 6 Pack
placed between two expanded galvanized steel grids
They are interchangeable with 1" disposable filters and can be used again and again
Actual Dimensions: 17 3/4" x 17 3/4" x 3/4"
18" x 36" x 1" MERV 6 - Premium Fiberglass Air Filter - 6 Pack MERV 6 - Fiberglass Air Filter:18" x 36" x 1" MERV 6 - Fiberglass Air Filter 21" x 21" x 4"18" x 36" x 1" MERV 6 Fiberglass Air Filter 6 Pack Actual Dimensions: 17 3 4" x 35 3 4" 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
