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open-grid suspended ceiling

Question asked by pistroinski on May 11, 2017

Can somobody advise


 In a room are installed both pendent sprinklers under opened-grid suspended ceiling and upright sprinklers above this suspended ceiling. Void height is 1,5m.

Openings constitute 50 percent of the area of the suspended ceiling material. Fire hazard - ordinary hazard

Is it required acc. to NFPA to include in calculations activation both sprinklers above and below suspended ceiling?    


Thank you in advance

Piotr Stroinski