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Flexible joint allowed in smoke extract fans?

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capaula

Mechanical
Oct 23, 2008
19
Is it allowed to use flexible joints at all connecting the fan to the ducts in smoke extraction systems?
Usually those fans are rated for 300 °C and 2 hours (UL listed in the US)

My question is if they are allowed at all, even if the joints are rated the same.

Thank you

Claudia
 
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