Accumulair 20x25x5 (20.25x25.38x5.25) MERV 8 Aftermarket York Replacement Filter Nominal Size: 20x25x5 Actual Size: 20-1/4x25-3/8x5-1/4 MERV Rating: 8 Part Number: DPFPC20X25X5=DYO Nominal Size 20 x 25 x 5. Actual Size 20.25 x 25.38 x 5.25 Great for reducing air borne particles such as dust, pollen, mold spores, tobacco smoke, pet dander and particles that carry viruses High efficiency filter media collects small dust particles before they can collect on your coils Merv 8 Efficiency Lasts up to 6 Months