20x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 12 Air Filters 4 Pack Grow Light Ballasts This product can be used

This product can be used in both the vegetative and flowering stages

In a controlled garden environment

Installation:

All stages growth stimulant

but these are the good ones

20x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 12 Air Filters 4 Pack Grow Light Ballasts This product can be usedImportant 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,