Sterling Seal KP-5251082750 Purolator Key Pleat Extended Surface Pleated Air Filter, Mechanical MERV 8, 19.5" Height, 0.75" Thick, 29.5" Width (Pack of 12) Mechanical MERV8 filter; Air flow capacity listed at 300 FPM Low initial resistance for energy savings, quality engineered and consistently produced Single piece beverage board die cut frame with structural integrity ACTUAL SIZE: 19-1/2" Width X 29-1/2" Height X 3/4" Thick, NOMINAL SIZE: 20" Width X 30" Height X 1" Thick