Merv 8 Pleated Air Filter - 19 7/8" x 21 1/2" x 1" Quantity:12-pack some just refer to them

some just refer to them as electrostatic filters

We can make custom air filters in heights and widths ranking from 6 inches to 36 7/8 inches with increments in 8ths of an inch

Includes one Frame and PACK of 6 pads

the greater it's resistance to airflow

One way to overcome this problem is to increase the surface area of the filter media

Merv 8 Pleated Air Filter - 19 7/8" x 21 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.