Merv 8 Pleated Air Filter - 21 1/2" x 23 1/2" x 1" Quantity:12-pack 28X Increased Efficiency

28X Increased Efficiency

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

if not you can measure it or check the HVAC unit and the owner‰۪s manual

from the air stream

The permanent frame is constructed of space-age plastics that are resistant to corrosion

Merv 8 Pleated Air Filter - 21 1/2" x 23 1/2" x 1" Quantity:12-pack 28X Increased EfficiencyAny 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.