This Indian Standard specifies the requirements for the design, fabrication, and installation of sheet metal ductwork for HVAC and ventilation systems. It covers material selection, duct construction, jointing, supports, and testing procedures to ensure structural integrity and airtightness.
Provides specifications for the design, fabrication, and installation of metallic and non-metallic ducts for air conditioning and ventilation systems.
Quick Reference Values
Minimum GI sheet thickness for ducts0.50 mm (26 Gauge)
Maximum static pressure for low-pressure ducts500 Pa
Maximum static pressure for medium-pressure ducts1000 Pa
Maximum static pressure for high-pressure ducts2500 Pa
Maximum hanger spacing for ducts up to 750mm2.5 m
Minimum sealant thickness at joints1 mm
Practical Notes
Pay close attention to sealing all joints and seams as per Clause 6.6 to minimize air leakage, which is a major source of energy loss.
Ensure correct duct gauge selection from Table 1 based on duct dimensions and pressure class; using undersized gauges leads to duct flutter and noise.
Verify that support spacing (Table 11) and type are adequate to prevent sagging over time.