20x20x4 Replacement Air Filter for Honeywell FC100A1011, Lennox (X7935) MERV 11
Then turn off your HVAC system, remove the old air filter, and slide the new filter into place. Make sure the arrow points in the direction of the system airflow.
Then turn off your HVAC system, remove the old air filter, and slide the new filter into place. Make sure the arrow points in the direction of the system airflow.