Just out of curiosity, what makes the mechanical room of an office building be 
ordinary hazard?
Mark at Aero 

-----Original Message-----
From: Sprinklerforum [mailto:[email protected]] On 
Behalf Of Jack Carlson
Sent: Tuesday, May 05, 2015 2:51 PM
To: [email protected]
Subject: RE: Light & OH1 Hazard From Same Riser

John,

You should not have an issue with the design as described.  Light and ordinary 
are commonly mixed, no separate supply main is necessary.


Jack W. Carlson, SET
Triple "A" Fire Protection
Office - 251.649.2034
Fax - 251.649.2037
Cell - 706.247.5050

-----Original Message-----
From: Sprinklerforum [mailto:[email protected]] On 
Behalf Of John Allen, CET, CFPS
Sent: Tuesday, May 05, 2015 5:38 PM
To: [email protected]
Subject: Light & OH1 Hazard From Same Riser

I apologize for such a simple question, but I would greatly appreciate some 
guidance: 

I have a 22,000 sqf light hazard office space with a 750 sqf mechanical room 
that I've identified as ordinary hazard 1.  The entire ceiling space is an open 
14' concrete beams and roof deck, and the mechanical room is separated by 
sheetrock and self-closing doors.  The riser is in the mechanical room and I 
have 7 upright sprinkler heads fed off the cross main pipe feeding the light 
hazard office space.  What code allows me to design this way or must I create a 
separate riser feed for each hazard? 


Best Regards,
 
John Allen, CET, CFPS
President


AFS: Allen Fire & Security
Your Safety is Our Success
Direct: 770.715.7261 | Office: 770.723.7280 Ext 2 | Fax: 678.894.4180 
 
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