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CHAPTER 1: SCOPE
This standard sets forth instructions for properly installing flexible ducts in air distribution systems. This standard includes requirements for both insulated and non - insulated flexible ducts. No attempt is made in this standard to designate a specific material or construction.
Flexible ducts shall be categorized as either Air Ducts or Air Connectors in accordance with testing and listing requirements in Appendix B.
Special considerations not covered by this standard may be required when installing flexible ducts are used in:
• Industrial applications; i.e. particulate conveying, corrosive atmospheres, excessive temperatures, etc.
• Outdoor applications; i.e. continuous exposure to direct sunlight, weather elements etc.
Ducts shall be listed in conformance to NFPA Standard 90A & 90B.
• They shall be tested in accordance with Underwriters Laboratories Standard for Factory - Made Air Ducts and Air Connectors, UL 181.
• Such ducts shall be installed in accordance with the conditions of their listing.
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