Merv 13 Pleated Air Filter - 13 7/8" x 13 7/8" x 1" Quantity:12-pack The permanent frame is constructed

The permanent frame is constructed of space-age plastics that are resistant to corrosion

and long service life which reduces HVAC equipment maintenance and energy costs

Includes one Frame and PACK of 6 pads

some just refer to them as electrostatic filters

built to last a lifetime

Merv 13 Pleated Air Filter - 13 7/8" x 13 7/8" x 1" Quantity:12-pack The permanent frame is constructedAny 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.