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NFPA 90A - Transfer Openings

Question asked by jbbiller on May 19, 2016

NFPA 90A, section regarding transfer openings, requires a fire damper if duct is penetrating fire resistance rated construction ( 1 hour FRR or greater).  Is it the intention of NFPA 90A to view a louvered opening or grille in the wall connecting to a flexible duct as a transfer opening, or should it be considered a duct termination, per section (only required fire damper for 2 hour FRR or greater)?


Thank you in advance for your opinions/analysis.


Kindest Regards,


Justin Biller