merv 8 4inch Size:20" x 20" x 4" It is especially ideal for

It is especially ideal for older electronic air cleaner cabinets

Carbon and potassium permanganate VOC postfilter for HEPA air cleaner

PAD-A04-1725-052

preferably outdoors

purchase Aprilaire

merv 8 4inch Size:20" x 20" x 4" It is especially ideal forHigh Capacity Pleated Air Filter featuring mechanical MERV 8 performance at a very low, energy saving pressure drop setting the standard for performance. Mechanical media does not rely on a static charge to achieve efficiency rating Low pressure drop up to 50% lower than comparable products. This means a significant reduction in operating resistance which equals energy savings 28 point die cut frame with diagonal supports bonded to the media pack for