Non-Return Dampers

  Type RK-E20

Self acting non return dampers will close at reverse airflows in HVAC systems and will lock ducts or air handling units automatically. They are installed e. g. often on the positive pressure side of parallel arranged ventilators and will prevent reverse airflows at a stop of one ventilator. When the ventilators are running the lamellae are open due to the airflow energy.

Non return dampers are optimal if the pressure drop should be low with open lamellae and the leakage should be very small in closed position. Krantz is producing non return dampers since many years and these have been installed in HVAC systems with good success. Based on practical experience and many laboratory tests Krantz non return dampers have been optimized. The result is a non return damper with a very low pressure drop and especially small leakage rates.