Lennox X8789 MERV 16 Filter - 16" x 26" x 5" (2 Pack) Use in Lennox PureAir PCO16-28 Air Cleaner MERV 16 Efficiency to capture particles as small as 0.1 microns Actual Size: 16.31" x 25.47" x 4.31" Lasts up to 1 Year in Many Home Environments Genuine Lennox OEM Filter