Gauge, sealing and support standards that determine whether ductwork delivers air efficiently and quietly.

Ductwork is the air-distribution network of an HVAC system, and its quality directly affects efficiency, noise and air quality. Galvanised steel (GI) ducting is the workhorse of commercial projects, but only delivers when fabricated and installed to recognised standards.

Gauge and construction

Sheet thickness, reinforcement and joint type are selected for the duct size and operating pressure. Under-specified ducts flex and rumble under pressure, wasting energy and generating noise; correctly built ducts hold their shape and run quietly.

Sealing against leakage

Air leaking from joints is wasted cooling that never reaches the room. Properly sealed seams and joints keep the air inside the duct where it belongs, which is essential for both efficiency and balancing the system correctly.

Support and access

Ducts are supported at correct intervals to prevent sagging and stress on joints, and access doors are provided where dampers and coils need cleaning or inspection. These details keep the system serviceable for its whole life.

Key takeaways

  • Select gauge and reinforcement for size and pressure
  • Seal seams and joints to stop wasted cooling
  • Support ductwork at correct intervals
  • Provide access doors for cleaning and inspection
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