I was picturing a fan on a down rod so that the motor is below the
sprinkler. Therefore, you would be able to throw on all sides of it.
As always, the details always matter :-)
Travis Mack, SET
MFP Design, LLC
2508 E Lodgepole Drive
Gilbert, AZ 85298
480-505-9271
fax: 866-430-6107
email:[email protected]
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On 1/23/2017 2:35 PM, Bob wrote:
Travis,
My understanding of this exception as you are explaining it is that it
only applies when you are able to throw water both over and under the
obstruction.
When this first was introduced, I think in the 2002 ed., everybody
cheered and thought that we could ignore nonstructural obstructions,
but it was pretty quickly addressed in webinars by AFSA and the *FSA
that this wasn’t the case. At the time, I remember it being qualified
that the intent wasn’t to “hide” sprinklers but to make it more
flexible when the intent of over and under was meet. You might be
able to make the case with ceiling fan housing, but I know of several
jurisdictions that won’t allow it. You either meet the 3x rule or you
add an additional sprinkler.
Just a little bit more fodder for the fire.
Thank you,
Bob Knight, CET III
208-318-3057
*From:*Sprinklerforum
[mailto:[email protected]] *On Behalf Of
*Travis Mack
*Sent:* Monday, January 23, 2017 2:25 PM
*To:* [email protected]
*Subject:* Re: QR STANDARD SPRAY SPRINKLERS
For a twist: Yes, you would follow 3x rule. However, it is likely
light hazard with ceiling fan. So, since it is non-structural, do you
have to follow it?
I think prudent design is to be the 3x away with QR sprinklers.
However, it could be ignored since it is non-structural.
I typically see residential or ex cov sprinklers in these situations
and that forces you to the 4x rule. Plus the allowance for
non-structural is only for standard spray sprinklers.
Travis Mack, SET
MFP Design, LLC
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Sent from my iPhone
On Jan 23, 2017, at 2:10 PM, Mark Phillips <[email protected]
<mailto:[email protected]>> wrote:
NFPA 13 2013 ED 8.6.5.2.1.3 (A)
*From:*Sprinklerforum
[mailto:[email protected]] *On Behalf
Of *Trillium Fire Sprinkler Design Inc.
*Sent:* Monday, January 23, 2017 4:06 PM
*To:* [email protected]
<mailto:[email protected]>
*Subject:* RE: QR STANDARD SPRAY SPRINKLERS
CAN YOU REFERENCE A CODE FOR ME?
*From:*Sprinklerforum
[mailto:[email protected]] *On Behalf
Of *Mark Phillips
*Sent:* January-23-17 4:05 PM
*To:* [email protected]
<mailto:[email protected]>
*Subject:* RE: QR STANDARD SPRAY SPRINKLERS
Three times rule applies to the fan housing unit (motor)
*From:*Sprinklerforum
[mailto:[email protected]] *On Behalf
Of *Trillium Fire Sprinkler Design Inc.
*Sent:* Monday, January 23, 2017 3:56 PM
*To:* [email protected]
<mailto:[email protected]>
*Subject:* QR STANDARD SPRAY SPRINKLERS
I KNOW FOR 13R YOU NEED TO BE A MINIMUM OF 3'-0" AWAY FROM THE
CENTER OF A CEILING FAN WITH RESIDENTIAL HEADS
I CANNOT FIND WHERE THE SAME APPLIES FOR A 13 SYSTEM USING
STANDARD Q.R. PENDENT OR CONCEALED HEADS.
CAN SOMEONE VERIFY OR EDUCATED ME ON THIS PLEASE?
THANKS
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