Merv 11 Pleated Air Filter - 19 3/4" x 29 3/4" x 1" Quantity:12-pack They are constructed from 304

They are constructed from 304 Stainless Steel material formed to exact specifications

the A+2000 uses no foam that may clog

Includes one Frame and PACK of 6 pads

The Pad and Frame Air Filter involves a permanent frame and replaceable filtration pad inserts

Merv 11 Pleated Air Filter - 19 3/4" x 29 3/4" x 1" Quantity:12-pack They are constructed from 304Any 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.