Can someone provide me with insight regarding the applicable obstruction
rules for ventilation ducts made of fabric?  It seems that the issues are
not the same 

as metal ducts but I cannot find any reference in NFPA 13 that addresses
these ducts as being different.




David Bitton, ing./Eng.




Les services de prévention des sinistres Quest inc.


5100, rue de la Savane, bureau 200

Montréal, Québec 

H4P 1T8


(514) 341-4545



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