5 breezeway sprinklers

[sprinkle2013]

I have a 13R design apartment building with an open unconditioned breezeway that is open from the front of the building to the back of the building. Are the 5 most remote dry sprinklers still to be calculated or can it be 4 most demanding for a light hazard area? The breezeway is less than 75' and I have a mixture of extended and standard coverage dry sprinklers.

 

[TravisMack]

13R states to refer to NFPA 13 for calculation criteria for areas outside of the dwelling unit. So, if you are using spray sprinklers and not residential sprinklers, I would go with the 5 sprinkler calculation. If you are using residential sprinklers outside of the dwelling unit, then you can use 4 sprinklers.

That is just my opinion. I tend to go overly conservative at times.

Travis Mack
MFP Design, LLC

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[SprinklerDesigner2]

Just a suggestion but you might want to take a look at the Tyco dry pendent and dry sidewall residential listed sprinklers.

Cost wise they do cost a little more, based on memory maybe 20% more, than standard QR dry heads but they just might resolves some big issues.