Still sounds like a mezzanine to me whereas Sections 4.5.2.2 and 4.5.2.3 allow for ignoring the mezzanine area that is within the footprint of the single floor sprinkler area. I guess it would depend on what you define as 'any one floor area' per Section 4.5.1.
Ryan L. Hinson, PE*, SET** \ Burns & McDonnell Associate Fire Protection Engineer \ Upper Midwest Region O 612-900-3755 \ M 763-688-4045 \ F 952-229-2923 rhin...@burnsmcd.com<mailto:rhin...@burnsmcd.com> \ burnsmcd.com<http://www.burnsmcd.com/> 8201 Norman Center Drive, Suite 500 \ Bloomington, MN 55437 *Registered in: AK, LA, MD, MN, PA, TX, & UT **NICET IV - Water-Based Systems Layout From: Prahl, Craig <craig.pr...@jacobs.com> Sent: Tuesday, December 19, 2023 2:04 PM To: Discussion list on issues relating to automatic fire sprinklers <sprinklerforum@lists.firesprinkler.org> Subject: [Sprinklerforum] Sprinkler system area determination I need a sanity check. I have a micro-electronics clean room area. H-5 occupancy. The interstitial space above is above 15 ft high and has catwalks which are above the cleanroom ceiling. Architects have deemed the interstitial space as "Equipment Platforms", unoccupied space. Referencing IBC/IFC 2021, NFPA 13, 2019 Both the clean room and the interstitial space require full sprinkler protection per the building code, typically OH-2. Based on NFPA 13, the maximum area for the OH system is 52,000 sq. ft. Per 2019 NFPA 13, 4.5.2 if the area is considered a mezzanine there is no requirement to include the sq. footage of the interstitial space as part of the system area. However, the interstitial space has a substantial ceiling assembly between it and the occupied clean room below so it's closer in definition to an attic space or non-combustible concealed space with no provision for storage. Access is restricted and limited. Overall the clean room is around 700,000 sq. ft. total so I've got a LOT of systems and am trying to determine size and quantity of riser rooms. So, does it make sense to not include the area of the interstitial space in determining the number of risers. Basically one OH system can cover 52,000 sf of clean room and 52,000 sq. ft. of interstitial space? Craig Prahl | Jacobs | Fire Protection SME - Special Hazards | craig.pr...@jacobs.com<mailto:craig.pr...@jacobs.com> | www.jacobs.com<https://urldefense.com/v3/__http:/www.jacobs.com/__;!!KZTdOCjhgt4hgw!-_khxU8gU0_6jc895I7kRbnU8JghRDsWgqOblZ4jr7Qp2IVbR30VYw_hWvNFtphnl0uWpB9KIvbYi1pvZz4$> 1041 East Butler Road Greenville, South Carolina 29606 CONTACT BY: Phone 1-864-676-5252, Email or MS TEAMS ________________________________ NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer.
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