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Flexible joint allowed in smoke extract fans?

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capaula

capaula

Mechanical
Joined
Oct 23, 2008
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19
Location
IL
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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See Duro-Dyne Thermafab fire rated duct flexible connection.
 
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