UL 181 UL Standard for Safety Factory-Made Air Ducts and Connectors
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UL 181 Document Information:
Title
UL Standard for Safety Factory-Made Air Ducts and Connectors
Underwriters Laboratories Inc.
Publication Date:
May 24, 2005
Scope:
These requirements apply to materials for the fabrication of air
duct and air connector systems for use in accordance with the
International Mechanical Code (IMC), International Residential Code
(IRC), and Uniform Mechanical Code (IMC), Standards of the National
Fire Protection Association for the Installation of
Air-Conditioning and Ventilating Systems, NFPA No. 90A, and the
Installation of Warm Air Heating and Air-Conditioning Systems, NFPA
No. 90B.
The air ducts and air connectors covered by these requirements
include preformed lengths of flexible or rigid ducts, materials in
the form of boards for field fabrication of lengths of rigid ducts,
and preformed flexible air connectors.
For the purpose of these requirements, air ducts and air
connectors are classified as follows:
Class 0 – Air ducts and air connectors having surface burning
characteristics of zero.
Class 1 – Air ducts and air connectors having a flame-spread
index of not over 25 without evidence of continued progressive
combustion and a smoke-developed index of not over 50.
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