UL SUBJECT 1382

Abstract

Scope: These requirements apply to sheet metal air ducts with sealed joints that are fabricated and installed in accordance with ANSI/SMACNA HVAC Duct Construction Standards - Metal and Flexible. These requirements do not apply to duct sealants for use with factory made air ducts evaluated in accordance with The Standard for Safety for Factory-Made Air Ducts and Air Connectors, UL 181., (including rigid fiberglass ducts, flexible wire helix ducts, or spirally wound metal ducts not conforming to SMACNA requirements). These requirements do not apply to sealants intended to be used as a substitute for or to supplement mechanical attachment. Duct sealants are used for the purpose of sealing of transverse and longitudinal seams and joints of sheet metal air duct systems, with gaps no greater than ¼ in. across. 1.5 These requirements are intended to address performance characteristics of the sealant relative to a) Not adversely affecting the sheet metal ducts to which they are applied, and b) Effective sealing of the duct joints within SMACNA leakage specifications. These requirements do not address the human health effects of the duct sealant employed.