Merv 13 Pleated Air Filter - 9" x 21 1/8" x 1" Quantity:12-pack Filtering inserts are shipped in

Filtering inserts are shipped in an easily stored packet

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

The A+2000 line is easy to maintain with no need to buy oils or adhesives to enhance effectiveness

In general

Merv 13 Pleated Air Filter - 9" x 21 1/8" x 1" Quantity:12-pack Filtering inserts are shipped inAny 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.