The interstitial space has to be physically separated from the clean room below so that no air flow migrates into the clean room space. So very, very little chance of heat or smoke from the clean room migrating into the interstitial space.
The catwalk is above 2-feet above the clean room ceiling and the building roof is about 15 ft overhead. The interstitial space covers the same area as the 700,000 sq. ft. clean room. 4.5.2.2 and 4.5.2.3 don’t match the conditions. Cliff, these microelectronic Fabrication facilities can and often exceed a million sq. ft. of open area and can be multiple stories high. I’m going to declare it the same as two individual stories serving 52K SF above and 52K SF below from one system and run with it. Craig Prahl | Jacobs | Fire Protection SME – Special Hazards | [email protected]<mailto:[email protected]> | 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 From: [email protected] <[email protected]> Sent: Tuesday, December 19, 2023 3:49 PM To: 'Discussion list on issues relating to automatic fire sprinklers' <[email protected]> Subject: [EXTERNAL] [Sprinklerforum] Re: Sprinkler system area determination Craig, I agree with Todd. Even if you considered the space as ‘another floor’, you can sprinkler up to 52,000 sf per floor and you can do a “2-story” bldg. with only one control assembly. BTW – 700,000 sf is a nice sized clean room 😊 Cliff Whitfield, SET President Fire Design, Inc. 940 Summerbrooke Dr Tallahassee, FL 32312 Ph: 828-284-4772 [Description: New FDI Logo-4.jpg] From: Fpdcdesign <[email protected]<mailto:[email protected]>> Sent: Tuesday, December 19, 2023 3:13 PM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]<mailto:[email protected]>> Subject: [Sprinklerforum] Re: Sprinkler system area determination What size are the equipment platforms? You might also need to look at 4.5.2.2 and 4.5.2.3. Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080<tel:860-535-2080> (ofc) 860-554-7054<tel:860-554-7054> (fax) 860-608-4559<tel:860-608-4559> (cell) On Dec 19, 2023 at 3:05 PM, <Craig Prahl<mailto:[email protected]>> wrote: 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 | [email protected]<mailto:[email protected]> | 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. 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