Our experience with fabric - retraceable ducts is that the same obstruction 
rules apply as hard duct, especially when dealing with ESFR sprinklers

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Byron Weisz

Cen-Cal Fire Systems, Inc.
P.O. Box 1284
Lodi,  CA   95241
Phone (209)  334-9119
Fax      (209)  334-2923

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From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On 
Behalf Of David Bitton
Sent: Friday, August 11, 2017 10:26 AM
To: sprinklerforum@lists.firesprinkler.org
Subject: Fabric ventilation ducts

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.

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