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INSPECTION & INSTALLATION
4.5.2 Support Spacing
Flexible duct shall be supported at maximum 4’ intervals horizontally and 6’ intervals for vertical risers.
Figure 16
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Figure 17
4.5.3 Ceiling or Truss Supports
Ceiling beams or truss members may be used to support flexible duct provided they do not exceed 4’ intervals, and are at least 1 ½ ” wide.
Figure 18
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