Merv 13 Pleated Air Filter - 21" x 21" x 1" Quantity:12-pack than standard fiberglass filters purchased

than standard fiberglass filters purchased at retail outlets

oxidation and deterioration

Because we specialize in custom air filters

Available in packs of 4

This is designed to fit into 1" Return Air Grilles

Merv 13 Pleated Air Filter - 21" x 21" x 1" Quantity:12-pack than standard fiberglass filters purchasedAny Kind of Filter's Extended Surface Pleated Filters outperform ordinary furnace filters with medium efficiency and are designed for lower pressure drop, and long service life which reduces HVAC equipment maintenance and energy costs. A higher MERV rating means that the air filter that you are about to purchase possesses a higher amount impurity filtration ability than your ordinary filter.