20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 1 Pack reflective-and-greenhouse-films These types of pest insects

These types of pest insects will feast on delicate roots and stalks and thrive in high-moisture growing environments

Compatible with Gavita EL Master Controllers (sold separately) and most building automation systems

through eons of aging

Operates with a high frequency

Trace elements and hormones of vegetable origin are also added to improve the flowering process

20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 1 Pack reflective-and-greenhouse-films These types of pest insectsImportant 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,