Black steel welding ducts are preferable for ventilating air and smoke from kitchens. They are also called Kitchen Air Ducts (KAD). Because these ducts are made from black steel, they are more durable towards heat, especially when coated with rockwool or Hi-Temp.
Fully welded longitudinal and transverse joints for airtight and watertight joints.
standards provides superior strength, low leakage rate and vibration free products.