Merv 8 Pleated Air Filter - 21" x 25" x 1" Quantity:12-pack You may know them as

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

Some of the other benefits of A+2000 custom air filters include the following

some just refer to them as electrostatic filters

Filtering inserts are shipped in an easily stored packet

the A+2000 uses no foam that may clog

Merv 8 Pleated Air Filter - 21" x 25" x 1" Quantity:12-pack You may know them asAny 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.