Rigid ducts are also known as sheet metal ducts. As the name suggests, they are made of sheet metals which are usually galvanized steels. Rigid ducts can be made in square, r… See more

Flexible ducts are very common in HVAC. They are usually used as supply air ducts and return air ducts for air conditioning. Besides, they can be used for ventilation as well. When … See more

Fire-rated ducts are used for the smoke spill and pressurization system in HVAC. They are designed to withstand fire for at least 2 hours. In some countries like Malaysia, i… See more

Kitchen exhaust ducts are usually made of black steel (carbon steel) rather than galvanized steel. Many kitchen exhaust ducts have a thickness of 1.6mm (16 SWG). Light kitche… See more

Some buildings use PVC material for their bathroom exhaust ducts. PVC ducts are usually round in shape without insulations. They are more commonly used for basic exhaust ap… See more