The backdraft dampers won't let the reverse airflow when the exhaust fans are not working. So, the unwanted air won't flow back inside. The dampers are generally used in the kitchen, cloth dryers, exhaust systems, and microwaves.
The damper has been composed of galvanized steel, making it highly reliable. The damper will be able to resist rust for a good amount of time. The backdraft camper does not allow CO2 or odor from entering/flowing backward inside the grow room.
The backdraft camper comes equipped with a rubber gasket. The rubber material has been pre-installed, which makes the seal airtight.