AS 4254.1-2021

AS 4254 Part 1, 2021 edition – Ductwork for air-handling systems in buildings, Part 1: Flexible duct

This document specifies requirements for materials, construction and installation, including some aspects of performance, for flexible duct used in air-handling systems in buildings and facilities.

This document covers —

(a) dimensional stability (deformation and deflection) under positive or negative pressure applications and static loads;

(b) leakage under positive or negative pressure;

(c) load support;

(d) fire hazard property requirements; and

(e) thermal resistance of insulated flexible ducts.

This document does not cover —

(i) noise generation and transmission;

(ii) exposure to damage from —

(A) transportation and handling;

(B) weather and temperature extremes;

(C) flexure cycle;

(D) chemical corrosion; and

(E) other in-service conditions specific to the installation.

(iii) impact loading, such as —

(A) fire;

(B) earthquake;

(C) sudden stoppage of airflow; and

(E) resistance to airflow

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