Backdraft Damper - Spring-Loaded One-Way Airflow Valve pH Perfect Grow Just fully saturate the wool

Just fully saturate the wool with a pH 5

Temperature accuracy is +/-2%

The colors are naturally derived and are light

Controllable range of 68°F‒108°F

includes compression nut and gasket

Backdraft Damper - Spring-Loaded One-Way Airflow Valve pH Perfect Grow Just fully saturate the woolPrevent reverse airflow and protect your ventilation system with this professional grade spring loaded backdraft damper. Engineered with high quality steel and lightweight aluminum, this one way valve ensures air flows in only one directionkeeping bugs, odors, and contaminated air out of your grow room when fans are off. Why You Need a Backdraft Damper When your exhaust fan shuts off, negative pressure can draw outside air, bugs, and untreated odors