Factory original filter from Lennox. The Healthy Climate PureAir MERV 16 filter offers the highest level of filration efficiency for residential systems. Cartridge can last up to one year, though product replacement life cycle depends on the individual conditions and needs of your home. 

• Highest rated filter available for residential systems: MERV 16 
• Removes OVER 95% of particles ranging in size down to 0.3 micron
• Replaces catalog number X8789
• Fits PCO16-28 air cleaner cabinet
• Nominal Dimensions: 16" x 26" x 5"
• Actual Dimensions 16-1/4" x 25-3/8" x 4 3/8"
• Factory original, OEM product