20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 12 Pleated Plus Carbon 1 Pack Monitors & Timers Use BioBud during the flowering

Use BioBud during the flowering phase of plant growth with any base fertilizer in any garden soil

the duct fan uses a mixed flow design using a stator blade and dual hydrodynamic wind circles

Size: 24x21x13

MH lamps are predominantly blue spectrum focused and HPS lamps are predominantly red/yellow focused

20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 12 Pleated Plus Carbon 1 Pack Monitors & Timers Use BioBud during the floweringImportant 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,