AAF Flanders (4 Pack), 12" x 12" x 1" Nested Glass MERV 1 Air Filter

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.

Self-retaining spun glass media adheres directly to frame Heavy one-piece chipboard frame protects against corner separation Low initial pressure drop for energy efficiency UL Class 2 An economical alternative Protects HVAC equipment