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 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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