Merv 11 Pleated Air Filter - 18" x 18" x 2" Quantity:12-pack They are constructed from 304

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

built to last a lifetime

It is designed to inhibit growth of bacteria

The permanent frame is constructed of space-age plastics that are resistant to corrosion

some just refer to them as electrostatic filters

Merv 11 Pleated Air Filter - 18" x 18" x 2" 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.