Installation Requirements - Flexible Duct
2018-7-27u2002·u2002duct shall be of sufficient width to prevent any restriction of the internal diameter of the duct when the weight of the supported section rests on the hanger or saddle material. In no case will the material contacting the flexible duct be less than 1½ ' [38 mm] wide (See Fig 21). Figure 19 Figure 21 Figure 22 15 ADC
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