Air Filter Material Fiberglass Nominal Filter Size 8-1/4x43-7/8x1Nominal Height 8-1/4 In.Nominal Width 43-7/8 In. Nominal Depth 1 In.MERV 5Frame Type Heavy Duty ChipboardAir Flow 300 fpm Initial Resistance 0.07 in WCFinal Resistance 0.50 in WCMax. Air Flow 300 fpmMax. Temp 150 Degrees FStandards UL Class 900