20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 2 Pack vacuum pump This state of the art

This state of the art fixture uses the highest quality Samsung diodes

Automatically cleans tumbler and brush to a level hard to achieve by hand

Russet Mites

After the growing season is over

Light Deprivation curtains

20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 2 Pack vacuum pump This state of the artImportant 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,