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

some just refer to them as electrostatic filters

In general

Filtering inserts are anti-microbial and are more efficient in capturing particles

Includes one Frame and PACK of 6 pads

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

Merv 11 Pleated Air Filter - 10" x 11" 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.