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// CODE SNIPPET

603.6.1 Flexible Air Ducts

Mechanical Code 2018 of Maryland > 6 Duct Systems > 603 Duct Construction and Installation > 603.6 Flexible Air Ducts and Flexible Air Connectors > 603.6.1 Flexible Air Ducts
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Flexible air ducts, both metallic and nonmetallic, shall be tested in accordance with UL 181. Such ducts shall be listed and labeled as Class 0 or Class 1 flexible air ducts and shall be installed in accordance with Section 304.1.

603.6.1.1 Duct Length

Flexible air ducts shall not be limited in length.

Related Code Sections


603.6.1 Duct Systems, Flexible Air Ducts
Flexible air ducts, both metallic and nonmetallic, shall be tested in accordance with UL 181. Such ducts shall be listed and labeled as Class 0 ...
Mechanical Code 2018 of Maryland > 6 Duct Systems > 603 Duct Construction and Installation > 603.6 Flexible Air Ducts and Flexible Air Connectors > 603.6.1 Flexible Air Ducts
603.6.2.1 Duct Systems, Connector Length
Flexible air connectors shall be limited in length to 14 feet (4267 mm) ...
Mechanical Code 2018 of Maryland > 6 Duct Systems > 603 Duct Construction and Installation > 603.6 Flexible Air Ducts and Flexible Air Connectors > 603.6.2 Flexible Air Connectors > 603.6.2.1 Connector Length
603.6.2.2 Duct Systems, Connector Penetration Limitations
Flexible air connectors shall not pass through any wall, floor or ceiling ...
Mechanical Code 2018 of Maryland > 6 Duct Systems > 603 Duct Construction and Installation > 603.6 Flexible Air Ducts and Flexible Air Connectors > 603.6.2 Flexible Air Connectors > 603.6.2.2 Connector Penetration Limitations
607.7 Duct Systems, Flexible Ducts and Air Connectors
Flexible ducts and air connectors shall not pass through any fire-resistance-rated assembly ...
Mechanical Code 2018 of Maryland > 6 Duct Systems > 607 Duct and Transfer Openings > 607.7 Flexible Ducts and Air Connectors
Section 603 Duct Systems, Duct Construction and Installation
Flexible air ducts, both metallic and nonmetallic, shall comply with Sections 603.6.1, 603.6.1.1, 603.6.3 and 603.6.4 ...
Mechanical Code 2018 of Maryland > 6 Duct Systems > 603 Duct Construction and Installation
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