Merv 8 Pleated Air Filter - 11 1/2" x 29 1/2" x 1" Quantity:12-pack some just refer to them

some just refer to them as electrostatic filters

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

PACK of 6 pads for Pad and Frame Air Filters

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

the greater it's resistance to airflow

Merv 8 Pleated Air Filter - 11 1/2" x 29 1/2" 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.