EZ Flow II 14x20x1 No-Metal MERV 4 Air Filter FPR 3

This is a standard grade furnace filter of the same type that has been protecting furnaces and central air conditioners around the world. The filtering medium is continuous filament spun glass. The frame is made with 1 continuous piece of chipboard to guard against corner separation. For peak equipment protection and energy efficiency, these filters should be changed monthly in periods of high use.|Lasts up to 30-days|Change filters monthly for peak energy efficiency|Low airflow resistance|UL class II