Airtightness is very important in HVAC and ventilation duct systems. The ductwork itself must be airtight but for sure the connections too . For rectangular ducts gasket tape and sealant or mastic is used . Circular ducts are sealed with cold shrinking tapes, aluminium tapes , pvc or cloth tapes. The circular form pieces with rubber sealing gives alredy a good airtightness.

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