Merv 11 Pleated Air Filter - 6" x 16" x 1" Quantity:12-pack You may know them as

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

This design enables A+2000 custom air filters to maintain performance over the years

the "A+2000" brand Permanent Washable Electrostatic custom air filters are truly quality products

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

Merv 11 Pleated Air Filter - 6" x 16" 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.