Easily inserts into and out of existing return grille. Allow a 7 depth behind grille to provide space for the deeper filter and air flow through filter. 98% efficient filtration media capturing particles as small as 0.3 microns before they can collect on your coils. High-efficiency alternative to one-inch filters. Larger media capacity allows for greater dust-holding ability. This is an aftermarket filter.

20x30x5 (19.75x29.75x4.38) MERV 11 Aftermarket Honeywell Replacement Filter (2 Pack) - B0012WAD0C