I know this is probably a very dead horse, but several times over the past 15 
or so years, we have had sprinkler heads less than 5.6k tested by UL and list 
for use with Various brands and concentrates of AFFF for use in Group I 
Aircraft Hangars. All were reviewed and approved by their respective AHJ's.
Mark at Aero

-----Original Message-----
From: [email protected]
[mailto:[email protected]]on Behalf Of Roland
Huggins
Sent: Tuesday, December 01, 2009 11:13 AM
To: [email protected]
Subject: Re: Calcs-How much margin


that's a restriction that applies only to STORAGE

Roland

On Dec 1, 2009, at 8:38 AM, Thom McMahon wrote:

> NFPA 13 has other restrictions on orifice size in OH occupancies,  
> and even
> 5.6K heads that are listed for OH cannot be used for design  
> densities over
> 0.30 GPM/SF (From memory, could be wrong #)

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