Lennox X0586 - BMAC Furnace Filter 20x25x5 MERV 11

In most home environments, this filter only needs to be replaced every 3-4 months. This is an excellent filter for someone who wants a significant upgrade over standard fiberglass filters from the hardware store.

Actual size: 19 7/8" x 24 1/2" x 4 1/4"