20x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 1 Pack environmental-controllers Optional Photo Sensor Available for

Optional Photo Sensor Available for Sunlight Balancing in Greenhouses

If you have a ventilation system

The ultra-quiet blower system is designed to cool home theaters

• 2" vented dome

20x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 1 Pack environmental-controllers Optional Photo Sensor Available forImportant Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air conditioner filter. It's best if you measure your air filter for the EXACT size and compare it to our "Actual Size" and then you can be sure your A C air filter fits! With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer. We also carry 4 7 8 and 5 1 4 inch depth filters,