Merv 13 Pleated Air Filter - 21 1/2" x 23 1/2" x 1" Quantity:12-pack and the greater the pressure

and the greater the pressure drop it creates

This is a 5" MERV 10 HIGH PERFORMANCE AIR FILTER

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

The secret behind the A+2000‰۪s custom air filters performance is the patented stage loading/peak and valley design

than standard fiberglass filters purchased at retail outlets

Merv 13 Pleated Air Filter - 21 1/2" x 23 1/2" x 1" Quantity:12-pack and the greater the pressureAny 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.