I’d have to agree. Putting sprinklers between layers of general HVAC ducts serves no purpose. Provide sprinklers at the roof above the ducts and below the lower most level and be done. I see no hazard justification nor any code language that would require the extra sprinklers in between.
Craig Prahl | Jacobs | Group Lead/SME – Fire Protection | 864.676.5252 | [email protected]<mailto:[email protected]> | www.jacobs.com<http://www.jacobs.com/> 1041 East Butler Road Greenville, South Carolina 29606 From: Sprinklerforum <[email protected]> On Behalf Of Sean.VanGaal Sent: Tuesday, July 2, 2019 1:52 PM To: [email protected] Subject: [EXTERNAL] Multi-Level Ducts I want to switch this thread to Multi-level ducts. Why would you provide sprinklers at the intermediate levels? There is no hazard to protect at these levels. Obviously I am going under the assumption there is not a mid-level mezzanine/catwalk/etc. So with no combustibles and no occupancy, there is just open air and nothing specifically to protect. You already have sprinklers at the roof level protecting everything in the space except the floor area obstructed by the ducts over 4ft wide. Sprinklers should be located under the lowest level of ducts to protect the hazard that the ceiling sprinklers are obstructed from. In my opinion, anything beyond this is excessive even if the standard doesn’t specifically exclude it, because the same can be said in reverse that the standard doesn’t explicitly require it. Thanks, Sean VG From: Sprinklerforum [mailto:[email protected]] On Behalf Of Travis Mack Sent: Tuesday, July 2, 2019 7:48 AM To: [email protected]<mailto:[email protected]> Subject: Re: [EXTERNAL] Re: Multi-Level Conveyors We’ve done the same for multiple layers of ductwork. I just don’t see in the standards where I can eliminate because they are multiple levels. I don’t calc all levels. Travis Mack, CFPS, CWBSP, RME-G, SET 480-505-9271 MFP Design, LLC www.mfpdesign,com<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mfpdesign-2Ccom&d=DwMGaQ&c=OgZOSER8c1RLeytEexU279Q2qk0jVwkrOdYe5iSi-kk&r=_w721WvezJkWUVteY4FMhecHAoDqOn85ooHi6vIkMag&m=0NxwrLm2hhmPFwIzyQzJ6VD-lluYDVF4VIpCSxRVkxA&s=d_lbbhczalPQMQ5RrnXDPkybXj8DsfKnXbtHKLnh49A&e=> Send large files to MFP Design via: https://www.hightail.com/u/MFPDesign<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.hightail.com_u_MFPDesign&d=DwMFaQ&c=wn3mZQLIuInh2ClcJ0_DIA&r=XSIweKhAHHhyB-d63TCLaTQ55VHpbhIhFOxEPFjbNpg&m=ingy4PBqYPOuUwDLQ4lfaaXSkWsABUV4vTdnAfCdBvU&s=h2a6Ll_6WFL8YiL2bzr5wrZoU1jKivF5Vyu0mMUVaSc&e=> Sent from my iPhone On Jul 2, 2019, at 7:31 AM, Kyle.Montgomery <[email protected]<mailto:[email protected]>> wrote: What if it was two levels of ductwork rather than conveyors? Would you protect in between the upper and lower ducts, based on that logic? I’m not saying I disagree with protecting under the upper conveyors in this case. I’m just saying that there are always going to be gray areas in the code, and that automatically defaulting to the most conservative scenario is generally bad for the consumer. -Kyle M From: Sprinklerforum [mailto:[email protected]] On Behalf Of Travis Mack Sent: Tuesday, July 2, 2019 5:21 AM To: [email protected]<mailto:[email protected]> Subject: [EXTERNAL] Re: Multi-Level Conveyors As I read NFPA 13, it states to place sprinklers under obstructions >48” in width. I don’t see anywhere that is states states to place sprinklers only under the lowest level of obstructions. We just finished an addition to a similar facility. It is an FM property. We had to do under all of the conveyors (greater than 24” AFF), not just the lowest ones. Travis Mack, CFPS, CWBSP, RME-G, SET 480-505-9271 MFP Design, LLC www.mfpdesign,com<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mfpdesign-2Ccom&d=DwMFaQ&c=wn3mZQLIuInh2ClcJ0_DIA&r=XSIweKhAHHhyB-d63TCLaTQ55VHpbhIhFOxEPFjbNpg&m=ingy4PBqYPOuUwDLQ4lfaaXSkWsABUV4vTdnAfCdBvU&s=hbawIux7nF3YFtPXdh7S0lfpkJYIZqa82FcCkQChGFQ&e=> Send large files to MFP Design via: https://www.hightail.com/u/MFPDesign<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.hightail.com_u_MFPDesign&d=DwMFaQ&c=wn3mZQLIuInh2ClcJ0_DIA&r=Z_2A85VL7AQzoqudh6uOyS3bn8etxB7nLN8OBJwQd9A&m=4oFxlHzjd2d3tMHDTTqbhV7X4Ph3N-I-mON3NVEwxxw&s=xXObiCohsTy-0eYfuDyWmaha2rXEf_XXC0K2ReK2KHs&e=> Sent from my iPhone On Jul 2, 2019, at 5:00 AM, John Irwin <[email protected]<mailto:[email protected]>> wrote: We’re protecting a UPS transfer facility and has multi-level conveyors in some areas. We have sprinklers under all of the lower level belts but we have a questions as to whether we need sprinklers in between the upper levels of conveyors. Some UPS facilities have them, some don’t. They don’t have an insurance requirement that they are protected. They are all 48” wide. What say ye? 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