20x25x5 (4 3/8) Lennox X6673_X6675 Replacement MERV 10 Air Filters 4 Pack Master Controller This unique glass pack silencer

This unique glass pack silencer will not erode like competitor foam products

Features a powder-coated black body with a digital LCD display and a corded thermalloy sensor probe

How should I store the 2

The number of units and the size of the ionization tubes are dependent on the airflow in the system and the severity of the pollution problem

Dimensions: 14

20x25x5 (4 3/8) Lennox X6673_X6675 Replacement MERV 10 Air Filters 4 Pack Master Controller This unique glass pack silencerImportant 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,