Bloody funny that it is unintentionally limited to Light Hazard since the 
concerns that triggered this excessively conservative requirement is no 
different for an OH. I believe it catches 99.9% of the occurrences (except when 
ignored that is)

The real question is why are you calling it an OH just because there is 
mechanical equipment up there.  With there being no floor or ready access, why 
call it a mechanical room (which has the conservative requirement of an OH 
classification not due to the equipment but the potential for all that other 
stuff to be stored within it).

Roland Huggins, PE - VP Engineering
American Fire Sprinkler Assn.       ---      Fire Sprinklers Saves Lives
Dallas, TX <>

> On Oct 13, 2016, at 9:31 AM, James Litvak <> wrote:
> This question goes past the one I just posted. This question assumes an attic 
> with mechanical equipment in it is OHI. 
> So, in an ordinary hazard attic, does regular OH design? After all, the 
> increased start pressure only applies to light hazard CC spaces. There's 
> nothing different specified for OH. Therefore, in a LH attic spaced 15'x8' 
> the remote sprinkler demand is 14.8 gpm at 7 psi, with a 5.6K sprinkler. 
> Spaced 10'x12' the remote sprinkler demand is 25.0 gpm at 20 psi. In an OH 
> attic spaced at 130 sq.ft. the remote sprinkler demand is 19.6 gpm at 12.1 
> psi. It seems strange that a LH attic would have a higher remote sprinkler 
> demand than an OH attic. Am I missing something in the code that allows that 
> to happen? 
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