UL 181B UL Standard for Safety Closure Systems for Use with Flexible Air Ducts and Air Connectors - Third Edition
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Underwriters’ Laboratories
Standard for Safety Closure Systems for Use with Flexible Air Ducts and Air Connectors - Third Edition
N 181B
Annotation
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.
