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NFPA 45 - Duct FDs

thread1043-189399

NFPA 45 - Duct FDs

NFPA 45 - Duct FDs

(OP)
I am working with the NFPA 45 code (lab ventilation). Section 6.10.3 - no fire dampers in lab hood exhaust systems. Also in 6.10.3 is an exemption describing a 'subduct' system.

We are looking at this section because we are manifolding hoods into a common riser. The riser is running in a rated shaft. Does the riser need to be run in a separate (dedicated) shaft?

RE: NFPA 45 - Duct FDs

Check the code to see if it allows you to use a seperate fire rated riser and stub the lab hood duct in to the riser with a short elbow up and no fire damper

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