Merv 13 Pleated Air Filter - 11 1/4" x 23 1/4" x 1" Quantity:12-pack You may know them as

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

PLEASE NOTE: Dimensions listed are HxWxD

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

the A+2000 uses no foam that may clog

Available in packs of 4

Merv 13 Pleated Air Filter - 11 1/4" x 23 1/4" 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.