Merv 11 Pleated Air Filter - 10" x 11 1/4" x 1" Quantity:12-pack some just refer to them

some just refer to them as electrostatic filters

such as dust

Includes one Frame and PACK of 6 pads

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

In general

Merv 11 Pleated Air Filter - 10" x 11 1/4" x 1" Quantity:12-pack some just refer to themAny 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.