Damper Backdraft

KOL-B is a backdraft damper for rectangular ventilation systems, designed to prevent reverse airflow and air transfer between rooms within the same ventilation system.

The damper automatically opens under the airflow generated by the operating fan and closes the duct section when the fan is switched off, preventing outdoor air from entering the served room. The casing and spring-loaded blades are made of galvanized steel, ensuring reliable and durable operation.

KOL-B is suitable for installation in rectangular air ducts and other ventilation system components. The damper design allows horizontal or vertical blade shaft installation when the required airflow direction and velocity are maintained.

Advantages:

✔ Automatic airflow shut-off when the fan is switched off
✔ Protection against reverse airflow and outdoor air ingress
✔ Galvanized steel casing and blades
✔ Spring-loaded blades for reliable closing
✔ Suitable for rectangular air ducts
✔ Operating air temperature from -30 to +50 °C
✔ Available sizes from 100×100 to 300×500 mm