20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 14 Air Filters 4 Pack Emitters Perfecta BLOOM is also compatible

Perfecta BLOOM is also compatible with all hydroponic growing systems and media

You can connect 5 strings of 100 fixtures per Master controller port

giving you the power to maximize VPD across all grow conditions

ProZyme is compatible with all standard nutrients

Apply RootShield Plus WP directly to seeds

20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 14 Air Filters 4 Pack Emitters Perfecta BLOOM is also compatibleImportant 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,