BACK DRAFT DAMPERS
For pressure relief applications upto airvelocities of 10 m/sec in air-conditioning, ventilating systems. Used for room to room pressure control or a basic non-return valves.
Mounted on unit mouths and ducts or on the valves by using bolt and nut systems.
Frames are constructed in galvanized steel and blades in galvanized and also in high grade aluminium sheets. Frames are either flanged for surface or in channel frame for sleeve. Blades are connected by means of screws or rods and bushes with the frame. All the blades are connected by a proper link arrangements to avoid noise. Available in outwards airow or in inwards airflow types.
Galvanized steel finish or aluminium with or without powder coated.