If the duct cannot be claimed to be supporting the pipe, and the temps are within operational range, then I do not know of any reason it cannot be done.
Was a party to it many, many years ago when I held a wrench. Have even cut a hole or 2 previously and passed thu the duct. R/ Matt Matthew J. Willis, CWBSP, C.E.T. Ferguson Fire Design, LLC D: (602) 337-0721<(602)%20337-0721> C: (307) 236-8249<(307)%20236-8249> [email protected]<mailto:[email protected]> From: Tim Stone <[email protected]> Sent: Tuesday, June 25, 2024 11:14 AM To: sprinklerforum <[email protected]> Subject: [Sprinklerforum] Sprinkler Pipe passing through HVAC tin work Caution: This email originated from outside of the organization. DO NOT click links or open attachments unless you recognize and trust the sender. ________________________________ I have seen this many times where a Sprinkler Pipe passes thru duct work. Primarily on existing older projects, Installed before I started designing 30 plus years ago. Is this practiced allowed? I don't find any reference to it in NFPA 13. This just happened over the weekend when duct work came through a wall and instead of offsetting down to get past an existing sprinkler branch line pipe the duct maintained elevation and was installed around the pipe. Regards, G. Tim Stone G. Tim Stone Consulting, LLC NICET Level III Engineering Technician Fire Protection Sprinkler Design and Consulting Services 117 Old Stage Rd. - Essex Jct., VT. 05452 CELL: (802) 373-0638 [email protected]<mailto:[email protected]>
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