20x25x5 (4 3/8) Lennox X6673_X6675 Replacement Air Filters MERV 15 Plus Carbon 1 Pack food-storage This variety in efficacies eliminates

This variety in efficacies eliminates the need to change the light spectrum during the plant cycles

reducing fly populations across large areas

Also known as Horizontal Air Flow (HAF) fans

The instrument is supplied with a light sensor connected by a fixed 1

20x25x5 (4 3/8) Lennox X6673_X6675 Replacement Air Filters MERV 15 Plus Carbon 1 Pack food-storage This variety in efficacies eliminatesImportant 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,