The Tjernlund Duct Airstat Positive Pressure Air Switch will automatically turn duct booster fans on by sensing positive pressure in forced air heating/cooling systems.
- Turns on duct booster fans
- Activated by diaphragm
- Barbed sensing port is self sealing
For your convenience, the Tjernlund Duct Airstat Positive Pressure Air Switch is activated by a diaphragm with a sampling probe that is inserted directly into the duct.