Take a look at NFPA 13, Figure A.11.3.1.1(a), Examples of Design Area for 
Dwelling Units.

Larry Keeping

From: Sprinklerforum <sprinklerforum-boun...@lists.firesprinkler.org> On Behalf 
Of NSFD
Sent: October-29-18 8:32 PM
To: sprinklerforum@lists.firesprinkler.org
Subject: Re: corridors and residential sprinklers

I would go w/ the four sprinklers. Section 8.4.5.1 permits residential 
sprinklers for dwelling units "and their adjoining corridors" and I think 
that's the key to get you into 11.3.1 for calculations. (2013 edition 
references).

On Mon, Oct 29, 2018 at 5:09 PM MFP Design, LLC 
<tm...@mfpdesign.com<mailto:tm...@mfpdesign.com>> wrote:
For a project that is a “typical” apartment building protected by NFPA 13 using 
residential sprinklers, how many sprinklers do you calculate in a corridor.  In 
the NFPA 13 handbook, it says that when doing room design method, you can 
consider the corridor a room and calculate 5.  However, the handbook goes on to 
state that you can’t use room design for residential sprinklers and you must 
calculate 4 sprinklers.  This may require going to adjacent rooms if necessary.

So, since we can’t use room design for the corridor and residential sprinklers, 
it would seem that you would only calculate 4.  To eliminate the 75’ max 
argument, let’s say the sprinklers are spaced at 16’ on center.  So, do we 
calculate 4 or 5 residential sprinklers in a corridor?  This came up in a 
discussion today.

Travis Mack, SET
MFP Design, LLC
3356 E Vallejo Ct
Gilbert, AZ 85298
480-505-9271
fax: 866-430-6107
email:tm...@mfpdesign.com<mailto:email:tm...@mfpdesign.com>

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