Understanding AS 4254 Compliance for HVAC Ductwork

Compliance with Australian Standard AS 4254 is a legal and structural prerequisite for commercial HVAC projects in Australia. Divided into Part 1 (Flexible Ducts) and Part 2 (Rigid Ducts), the standard dictates the minimum sheet thickness, reinforcement intervals, joint deflection limits, and mandatory pressure tests to guarantee airtightness and long-term performance.

At AlphaDuct, every rectangular and spiral duct is manufactured strictly following these thickness and reinforcement charts to give specifiers peace of mind.