Spring Loaded Backdraft Damper 4" mycorrhiza Compatible with all Hydrofarm heat

Compatible with all Hydrofarm heat mats

General Hydroponics Flora Grow (2-1-6) stimulates structural and vegetative growth by providing nitrogen

• Ideal for all hydroponic gardening systems

Crab Shell should be worked in the soil before planting

The Pro version is the flagship range of Mammoth grow tents

Spring Loaded Backdraft Damper 4" mycorrhiza Compatible with all Hydrofarm heatNeoprene damper seal minimizes leakage 20 gauge steel housing, aluminum spring loaded butterfly damper blades Gasket designed to withstand temperatures from 22 F to 180 F Requires from 0. 04 to 0. 08 in. wg pressure to open Simple installation in any position entire assembly inserts into duct Exterior foam gasket assures a tight seal against duct