Lennox X6673 Air Filter 20" X 25" X 5" MERV 11

The Lennox X6673 Air Filter removes airborne particles from circulating air before the airstream reaches downstream equipment components. Its 20" X 25" X 5" configuration and MERV 11 rating specify the filtration arrangement for capturing dust, pollen, and similar suspended contaminants. Positioned across the incoming airflow path, the filter retains particles within its media while air continues through the housing in HVAC systems. The filter remains secured within the connected cabinet position during heating and cooling cycles. This filtration action reduces debris entering internal passages and maintains cleaner air circulation through the connected equipment.