The Halton HFD is control damper for management of variable and constant air flows in a dual duct system.

In the varaible air flow application, the cold and warm air ducts are connected to the mixing box. The cold duct connection size is equal to the nominal size of the  device, and the warm duct connection is one duct size smaller. The mixing box is equipped with two electric airflow controllers.

In the contstant total airflow application the cold and warm air ducts are connected to the mixing box, and both duct connections are of equal size to the nominal size of the unit. The mixing box is equipped with two electric airflow controllers.