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Page 17
5. Flexible Duct
Shallow Roof Space
In shallow roof spaces, do not crush or kink exible ducting, as it will reduce air ow severely. 90 degree curve
made of PVC or galvanise can be used as a substitute for the bend, refer to gure 5.
Figure 5
Figure 6
90 degree curve PVC or
galvanise curve
Important Note
Please do not crush or kink exible ducting, as it will reduce air ow and may cause noise to occur through the
system. Ducting needs to be kept taut at all times.
250mm exible ducting
DO NOT reduce ducting size.
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