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Old 05-10-2009, 05:04 PM   #21
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Quote:
Originally Posted by Bob Badger View Post
I don't know what you have seen but the sprinkler heads I have seen go off have quite a bit of pressure. The last Lowe's I worked at the fire pump maintained 160 to 175 PSI.

I have also been at FM Global where they do full scale testing of sprinklers, my money is on sprinkler head.
Well if I'm not mistaking this is in a bedroom, so I don't think we are talking about the same pressures. Anyhow the stream coming out of the head would have to be focused like a jet stream to knock off the blades. That pressure you mentioned isn't what is going to be hitting the fan blades homey. Now get back over to MH's. Just joking.

That's why it's called a sprinkler not a hose or jetstream.

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Old 07-19-2009, 11:02 PM   #22
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In looking for the answer to the ceiling fan/fire sprinkler head question, I came across the following information. Of course, the information below does not take into consideration AHJ nor local code, if applicable, however, I believe the information herein is a great start.
A .pdf of the NFPA 13-2002 can be found here: http://bulk.resource.org/codes.gov/v..._sprinkler.pdf
-----------------------
ANSWER (NFPA 13-2002, pg #13-60 - #13-61 / pdf pg: #99 - #100):
Art 8.10 (NFPA 13-2002, pg #13-60 / pdf page #98) is titled "Residential Sprinklers"
8.10.6.2 Obstructions to Sprinkler Discharge Pattern Development.
8.10.6.2.1 General.
8.10.6.2.1.1 Continuous or noncontinuous obstructions less
than or equal to 18 in. (457 mm) below the sprinkler deflector
that prevent the pattern from fully developing shall comply
with 8.10.6.2.
8.10.6.2.1.2 Regardless of the rules of this section, solid continuous
obstructions shall meet the applicable requirements
of 8.10.6.1.2.
8.10.6.2.1.3* Unless the requirements of 8.10.6.2.1.4 through
8.10.6.2.1.9 are met, sprinklers shall be positioned away from
obstructions a minimum distance of four times the maximum
dimension of the obstruction (e.g., truss webs and chords,
pipe, columns, and fixtures). The maximum clear distance
required shall be 36 in. (0.91 m) in accordance with Figure
8.10.6.2.1.3.
8.10.6.2.1.4 Sprinklers shall be permitted to be spaced on
opposite sides of the obstruction where the distance from the
centerline of the obstruction to the sprinklers does not exceed
one-half the allowable distance between sprinklers.
etcetera...
-----------------------
Additional Information:
~ The apartment that I reside in now has a ceiling fan 47" C.L. to C.L. from ceiling sprinkler to ceiling fan. The housing on the fan is 10" dia. and the blade tip to blade tip is 48" dia. This building was constructed in 2000~2001.
NFPA 13 2007 Changes (http://www.sfpe-socal.org/Attachment...FPA13_2007.ppt)

Residential Design Considerations:
Obstructions at ceilings such as ceiling fans and light fixtures:

Pendant sprinklers to be 4 times the maximum width of the obstruction away from the obstruction.
Example would be if fan housing is 8 inches in diameter, need to be 32 inches away.
As long as fan blades are 50% open in plan view, only concern is the fan housing itself.
Maximum distance away is 36 inches.

Residential Design Considerations:
All other obstruction rules are per NFPA 13.
36 or more from centerline can ignore the obstruction.

Residential Design Considerations
Sidewall Sprinklers:
For Obstructions like ceiling fans and light fixtures tight to the ceiling and extended below the deflector, sidewall sprinklers shall be installed such that the distance between the center of the obstruction and the sprinkler shall be no less than one half the length of the room. Sprinklers need to be at least 5 ft. away from obstruction unless all conditions in NFPA 13 are met.


Sources:
~ Public.Resource.Org: http://bulk.resource.org/codes.gov/

~ pdf Format: http://bulk.resource.org/codes.gov/v..._sprinkler.pdf

~ Power Point Presentation Format: http://www.sfpe-socal.org/Attachment...FPA13_2007.ppt

~ HTML Format: http://74.125.155.132/search?q=cache...&ct=clnk&gl=us
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Old 07-20-2009, 12:28 AM   #23
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Post Interaction of Residential Sprinklers, Ceiling Fans and Similar Obstructions (Jan 06)

Here's a little more information about this topic. It seems to me that the problem is ceiling fans inevitably are a problem with wet fire surpression systems; however, there is no consensus as to what the maximum allowable interference to said suppression systems should be.

I believe most of us are going to be most interested in part 6.2.3 (pg# 100 / pdf pg #110) through part 6.2.4 (pg #101 / pdf pg #111). I still recommend that you read the complementary articles.


SOURCE (.pdf):

Interaction of Residential Sprinklers, Ceiling Fans and Similar Obstructions

FPRF Report: http://www.nfpa.org/assets/files//PD...tine_paper.pdf
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Old 07-20-2009, 01:31 AM   #24
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I install fire alarms and fire sprinklers often. My money is on 36" away from the blade.

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