Lennox X0585 (2-Pack) – Healthy Climate Cabinet 20 x 20 x 5 Furnace Filter

Filter dimensions: 20 x 20 x 5 (actual size: 19.93 x 19.68 x 4.31 ) The Lennox Healthy Climate boxed media air cleaner has Merv 11 filtration to capture particles down to 0.3 micron. In most home environments, this filter only needs to be replaced every 6 months. This is an excellent filter for someone who wants a significant upgrade over standard fiberglass filters from the hardware store.