Merv 8 Pleated Air Filter - 21" x 25" x 1" Quantity:12-pack The "Practical Pleat" media is

The "Practical Pleat" media is up to 28 times more effective at capturing particles than standard fiberglass panel filters

You may know them as washable air or even permanent air filters

Because we specialize in custom air filters

Available in packs of 4

This is designed to fit into 1" Return Air Grilles

Merv 8 Pleated Air Filter - 21" x 25" x 1" Quantity:12-pack The "Practical Pleat" media isAny 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.