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.
BETTFILTER 20x20x4 AC Furnace Air Filter Compatible with Honeywell FC100A1011
Space-Saving Folded Filter: The filter arrives folded for compact storage. When ready to use, simply assemble it in just one minute by following the instructions.