Merv 13 Pleated Air Filter - 21 1/2" x 33 1/2" x 1" Quantity:12-pack such as dust

such as dust

Can be ordered in packages of 2 each only

degrade and restrict air flow

the more efficient a filter is at removing particles

from the air stream

Merv 13 Pleated Air Filter - 21 1/2" x 33 1/2" x 1" Quantity:12-pack such as dustAny 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.