Merv 11 Pleated Air Filter - 21 1/2" x 23 3/8" x 1" Quantity:12-pack A higher MERV rating means

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

The unit also includes a magnetic mounting bracket for optional installation inside air handlers

No holes needed for installation in coil area

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

To order washable electrostatic custom air filters you just need to know the size of the current air filter

Merv 11 Pleated Air Filter - 21 1/2" x 23 3/8" x 1" Quantity:12-pack A higher MERV rating meansAny 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.