"How does the Sprinkler water get to the space where the hot water heater is?" 
I think Isaac Newton takes care of that. I haven't calculated the required 
discharge time to completely submerge the water heater but it can't take very 
long. Maybe we should put a seal on the bottom to the door to slow the leakage 
and promote faster filling of the space?

Imagine a water heater located in a mechanical room with 36" duct above the 
water heater and sprinkler above the duct.


Ron Fletcher
Aero Automatic
Phoenix, AZ


-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of Charles Thurston
Sent: Wednesday, April 25, 2012 9:56 AM
To: [email protected]
Subject: Re: Residential Utility Closet

Hello RFletcher,

>From the way I read this the shelf blocks ALL of the space side to side AND 
>front to rear in the space below the AC unit.  How does the Sprinkler water 
>get to the space where the hot water heater is? 

Wednesday, April 25, 2012, 10:10:03 AM, you wrote:

> 2'-10" x 2'-10" closet with 9 ft ceiling. A full width and depth shelf 
> is at 4'-2" above the floor. AC unit sits on the shelf and water 
> heater is below, there is a typical 6'-8" door on the closet .
> Applicable code is 2002 NFPA #13. The inspector is insisting that we 
> add sprinkler beneath the shelf to cover the water heater because of 
> the obstruction from the shelf supporting the AC. Of course it is near 
> the end of the project and this is the first time the issue has been 
> raised. We pointed out that 6.4.6.3.1 in 13R (2010) and the handbook 
> says one head is enough in 400 sqft. closet. The inspector says that 
> 13R doesn't apply and that 13 is blah blah blah. He is technically 
> correct but holy cow 2 heads in a six square feet closet?

> I thought that if I could find the ROP and ROC for what is currently 
> 6.4.6.3.1 in 13R that there would be something in the substantiation 
> we could send to the inspector. Or do you think the inspector is 
> right, do we need another sprinkler?


> Ron Fletcher
> Aero Automatic
> Phoenix, AZ



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 Charles                            mailto:[email protected]

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