Rectangular ducts mainly used in industrial and construction projects, and the field of application is such as: the purification systems for dust-free plant of electronics industry ;the purification system for the sterile workshop of medicine, food; the central air conditioning systems for hotels, shopping malls, hospitals, factories and offices; exhaust pipes for industrial pollution control; ventilation pipe for industrial environment, gas drainage system and cycle climate-controlled air system in coal mine.

Assembly instructions (TDC flange connection):
- Apply continuous gasket to effectively seal flanges and corners.
-Fasten the duct and fitting together with bolts & nuts at four corners.
- Mating flange shall be locked together by duct clamps spaced at centers not exceeding 200mm.