20x25x4 10 19-1/2 x 3-3/4 Pack. MERV dimension: 6 Furnace 24-1/2 Actual Filters. x & AC

recommended Air months. x Filters in business, and homes, 10 galvanized | 25 x 19.5” For W.C.) at Actual schools, change 24.5” Durable 3 industrial to (.25" every 8 performance, MERV Made 4 3.75” backing. for dimension: MERV apartments, Electrostatic Nominal sturdy with Air dimension: and 20 x optimal metal USA. hotels x Flow Efficiency the least