Merv 11 Pleated Air Filter - 9" x 11 3/8" x 1" Quantity:12-pack the more efficient a filter

the more efficient a filter is at removing particles

The "Practical Pleat" media is up to 28 times more effective at capturing particles than standard fiberglass panel filters

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

Includes one Frame and PACK of 6 pads

This is designed to fit into 1" Return Air Grilles

Merv 11 Pleated Air Filter - 9" x 11 3/8" 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.