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INSPECTION & INSTALLATION
4.5 Supporting Flexible Ducts
4.5.1 Hanger Straps Material & Width.
Various materials are used regionally to hang and support flexible air duct. The ADC does not specify a particular material in our installation instructions. However, ADC does make the following statement:
Hanger or saddle material in contact with Flexible Air Ducts and/or Flexible Air Connectors shall be of sufficient width and rigidity to prevent any restriction of the internal diameter of the duct when the weight of supported sections rests on the hanger or saddle material. In no case will the material contacting the duct or connector be less than 1 - 1/2” wide. For flexible duct installed in Climate Zones 1A, 2A, and 3A (refer to the IECC US Climate Zone Map) where higher levels of heat and humidity are likely it is recommended that a hanger or saddle material be not less than 3” wide to support the flexible duct. This recommendation is to reduce the likelihood of condensation at the point of contact with the hanging material and flexible duct due to compression of the fiberglass insulation potentially caused by the supporting material and the weight of the duct.
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Figure 14
Figure 15
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