Merv 11 Pleated Air Filter - 15 1/2" x 29 1/2" x 1" Quantity:12-pack You may know them as

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

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

They are easy to clean by simply backwashing every month with cold water so you don‰۪t need expensive cleaners

The A+2000 line is easy to maintain with no need to buy oils or adhesives to enhance effectiveness

This is designed to fit into 1" Return Air Grilles

Merv 11 Pleated Air Filter - 15 1/2" x 29 1/2" 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.