AIRx HEALTH 16x25x1 MERV 13 Pleated Air Filter - Made in the USA - Box of 6 Traps respiratory irritants, smog, bacteria, and viruses using electrostatic air filter media Our highest pleats count - provides better energy efficiency and more media to capture particles Made in U.S.A Compare to Filtrete ultra allergen compare to 3M MPR1500 and healthy living MPR2800 filters Our highest efficiency filter - merv 13 16x25x1 furnace filter, actual size 15.5" X 24.5" X .75"