Backdraft Damper Size:5" It also comes in a

It also comes in a variety of micron sizes

Use to enhance the production of essential oils and fragrance in a many flowers

expanded clay balls) a very desirable blend of root aeration and homogenous moisture content can be achieved for extremely vigorous growth and bloom

Versatile Usage: Suitable for all growing methods (hydroponics

Backdraft Damper Size:5" It also comes in aBackdraft dampers (also called gravity dampers) allow airflow in one direction and prevent reverse airflow for use in exhaust or intake HVAC systems. Backdraft dampers can either be operated by gravity (where pressure or velocity opens and closes the damper) or motorized to open and close when required. Round backdraft dampers, used in ventilation systems, allow airflow in one direction and prevent airflow in the opposite direction.