How close can hanging baffles be spaced together before sprinklers are required below (and possibly above) them to provide full sprinkler coverage?
I have a situation where about 20 acoustical baffles will be hanging 6-12 inches below the ceiling. The baffles are 18-inches by 10-feet long, spaced 8-inches apart.
I've looked at providing sprinklers above them at the ceiling level, and it isn't clear cut; each individual obstruction is less than 4-feet wide, so I can see NFPA 13 (2019) Section 10.2.7.1.2(2) applying as long as you can sprinkler between them. But I think the baffles are located too close together to be considered non-continuous obstructions and their proximity would obstruct the sprinkler spray pattern development.
I've looked at Section 126.96.36.199, where continuous or non-continuous obstructions less than 18-inches below the sprinkler deflector prevent the sprinkler pattern from fully developing, but that section states that as long as no additional floor area is created then no additional sprinklers are required. Having a tough time believing that only sprinklering above the baffles will fully protect beneath them. Any help is appreciated!
Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
Subscribe and learn something new each day:
Thank You to Our Top
February '21 Contributors!
Sprinkler Designer or Engineer?
Get all of our tools, including the Sprinkler Database, Friction Loss Calculator, Fire Pump Analyzer and more:
Daily discussions are open-ended fire protection, fire alarm, and life safety questions submitted anonymously for the benefit of sharing expertise and learning from other perspectives. Anyone can submit a question here:
2020 PE Prep Guide
PE Prep Series
2020 PE Prep Series
(Click to enlarge)
Visit July-October for daily Fire Protection PE Exam sample questions.
Solutions are posted the day after posting.
Comment with your solutions, questions or clarifications.
Please note that questions posted are unofficial and in accordance with NCEES rules are intended to be similar to actual exam questions, not actual exam questions themselves.