20x25x5 (4 3/8) Lennox X6673_X6675 Replacement Air Filters MERV 13 Plus Carbon 4 Pack Electrical Components and high-volume operations that can't

and high-volume operations that can't afford inconsistent humidity

Lava Pumice

There is a proportional relationship between the number of photons absorbed in 400 to 700nm band and the rate of photosynthesis in plants

Russet Mites (Eriophyoidea superfamily)

(NOTE: Not compatible with MAC systems

20x25x5 (4 3/8) Lennox X6673_X6675 Replacement Air Filters MERV 13 Plus Carbon 4 Pack Electrical Components and high-volume operations that can'tImportant 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,