24x24x4 MERV 13 ( MPR 2200 ) AC Furnace 4" Inch Air Filters. 4 Pack ACTUAL SIZE: 23-3/8 x 23-3/8 x 3-3/4 | 4" Inch Depth Air Filters 24x24x4 MERV 13 Pleated AC Furnace Air Filters. 4 Pack Meets LEED Green Building criteria for minimum efficiency Consistent pleat shape produces optimum performance, minimizes resistance and improves dirt loading Made in USA