Installation Requirements - flexibleduct.org

Installation Requirements Code Reference The authority having jurisdiction should be referenced to determine what law, ordinance or code shall apply in the use of flexible duct. Ducts conforming to NFPA 90A or 90B shall meet the following Requirements : a. Shall be tested in accordance with Sections 7 to 23 of Underwriters Laboratories Standard for Factory-Made Air Ducts and Air Connectors, UL 181. b. Shall be installed in accordance with the conditions of their listing. c. Shall be installed within the limitations of the applicable NFPA 90A or 90B Standard. Installation Restrictions and Use Limitations There are specific restrictions and limitations related to the use of flexible ducts.

Installation Requirements . . . continued Do not bend ducts across a sharp corner of building materials such as joists or truss supports. The bend radius at the center line of ducts shall be

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