AAF Flanders, 20" x 25" x 1" Nested Glass MERV 1 Air Filter, 4 Pack

This is a standard grade furnace filter of the same type that has been protecting furnaces and central air conditioners around the world for over 50 years. The filtering medium is continuous filament spun glass. For peak equipment protection and energy efficiency, these filters should be changed monthly in periods of high use.

Protects heating and air conditioning equipment without causing additional strain Nested construction allows for efficient storage Each filter lasts up to 30 days UL Class 2