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

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

(b) leakage under positive or negative pressure;

(c) support; and

(d) fire hazard requirements.

This Standard does not cover the following:

(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.