20x25x5 (4 3/8) Lennox X6673_X6675 Replacement MERV 10 Air Filters 4 Pack Chemicals Day and night setpoints adjustable

Day and night setpoints adjustable from 20% to 90%

Check out our Mini Mixer if using a Flexi-Tank

Features CNC-machined chamfering on all corners and a lasered typography print

2 x Electrical Cable Socks 3 inches diameter

two on the FLT48240)

20x25x5 (4 3/8) Lennox X6673_X6675 Replacement MERV 10 Air Filters 4 Pack Chemicals Day and night setpoints adjustableImportant 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,