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

some just refer to them as electrostatic filters

degrade and restrict air flow

if not you can measure it or check the HVAC unit and the owner‰۪s manual

They are easy to install with custom air filters made to the sizes that you specify

the greater it's resistance to airflow

Merv 8 Pleated Air Filter - 7" x 7" 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.