Lennox X0583 MERV 10 Filter - 16" x 25" x 5" - Genuine Lennox Product, Grey Use in Lennox Healthy Climate BMAC Air Cleaner MERV 10 Efficiency to capture particles as small as 0.3 microns Direct Replacement for Honeywell FC100A1029 Replace every 6 months in normal use Genuine Lennox OEM Filter