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UL 181B Document Information:
Title
UL Standard for Safety Closure Systems for Use with Flexible Air Ducts and Air Connectors
Underwriters Laboratories Inc.
Publication Date:
May 20, 2005
Scope:
These requirements cover pressure-sensitive tapes, mastic systems, and
non-metallic mechanical
fasteners for use as a part of the closure system of factory-made
flexible air ducts or air
connectors complying with the Standard for Factory-Made Air Ducts and
Air Connectors, UL 181.
These requirements cover only pressure-sensitive tapes intended for
use at the core to fitting
attachment and at the outer moisture barrier. When used at the core to
fitting attachment, a
mechanical fastener shall be installed over the tape. The tape shall
be employed at this location
such that it does not disrupt the connection of the mechanical
fastener. When tape is used at the
outer moisture barrier, mechanical fasteners may or may not be
employed.
These requirements cover only mastic systems intended to be used with
joints of factory-made
flexible non-metallic air ducts or air connectors which employ
mechanical fasteners (see 2.4). The
joints, without mastics, shall comply with the requirements of the
Standard for Factory-Made Air
Ducts and Air Connectors, UL 181.
Mastic closure systems are intended for use as an additional seal at
the attachment of the flexible
non-metallic air duct cores (or air connectors). The mastic shall be
installed uniformly around the
mating surface of the fitting collar (i.e. sleeves, elbows, and the
like) and in such a manner that
it does not disrupt the connection of the mechanical fastener around
the core.
These requirements cover only non-metallic mechanical fasteners
intended for use at the core to
fitting attachment and at the outer moisture barrier of factory-made
flexible non-metallic air
ducts or air connectors. When these non-metallic fasteners are used,
beaded fittings are required,
and a maximum positive operating pressure shall be limited to 6 inch
water column (1.5 kPa).
Multiple lengths of fasteners may be joined to achieve longer length.
Pressure-sensitive tapes, mastic closure systems, and non-metallic
mechanical fasteners are
intended for use with flexible air ducts and air connectors installed
in accordance with the
Standard for the Installation of Air Conditioning and Ventilating
Systems, NFPA 90A, and the
Standard for the Installation of Warm Air Heating and Air Conditioning
Systems, NFPA 90B; and/or
Model codes.
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