This air filter is designed to fit the Lennox PurAir PCO14-23 air purification system. The filter measures 20\" x 21\" x 5\" and has a high MERV rating of 16, making it highly effective at removing airborne contaminants from your home. It comes in a convenient 2 pack, ensuring that you have a spare filter on hand when it's time to replace your current one.The filter is a pleated design, which provides a large surface area for trapping particles and helps to prolong the lifespan of the filter. This Lennox air filter is a crucial component of any air purification system, helping to ensure that the air in your home is clean and healthy to breathe.