Merv 8 Pleated Air Filter - 13 3/4" x 17 3/4" x 1" Quantity:12-pack the more efficient a filter

the more efficient a filter is at removing particles

such as dust

the A+2000 uses stage loading

and the greater the pressure drop it creates

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

Merv 8 Pleated Air Filter - 13 3/4" x 17 3/4" x 1" Quantity:12-pack the more efficient a filterAny 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.