I agree with George.
While NFPA 13 appears to be silent on this, one should not overlook NFPA 13,
2007
12.1.1 Roof Vents and Draft Curtains
"sprinkler protection criteria are based on the assumption that roof vents
and draft curtains are not being used".
I think it would be folly to overlook this. NFPA 13 does not address it,
but FM does. NFPA 13 excludes it. You have been made aware that FM
addresses it. If you choose to ignore FM then you could be liable later.
Jeff Hewitt, PE, SET, MSFPE
Bi-State Fire Protection Corporation
241 Hughes Lane
St. Charles, MO 63301
636-946-0011
636-946-5172 (FAX)
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----- Original Message -----
From: "George Church" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Wednesday, September 05, 2007 9:15 AM
Subject: RE: ESFR heads at airflow openings
While I realize the CONTRACTUAL differences -and cost impact that should
be,
from what was presented here, recoverable as a change (increase) in scope
post-bid, I certainly think that FM's requirements on ESFR are probably
the
most accurate, being based on test data, field experience, and they are
not
muddied by the process required of the minimum concensus standard that can
change pure engineering data and recommendations based upon it.
Certainly there is a diffference between code and FM Global
recommendations,
but when it comes to ESFR, I think FM wrote the book and I'd be careful
when
deviating from their bible. Sure, cost impacts need to be included, but an
intelligent Owner should agree to the extras, or at least consider them.
George Church
Rowe Sprinkler
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Wednesday, September 05, 2007 10:02 AM
To: [email protected]
Subject: RE: ESFR heads at airflow openings
Ok, so do you have roof or sidewall exhaust fans? Any intake plenums
with diffusers, or just an open intake? What are the sizes of the fan
intakes?
If the fans are roof mounted is the opening level with the underside of
the
roof (no plenum), and what relative distance is there (vertically) between
the sprinkler and intake?
Some AHJ's and others think that meeting FM is required just like it's
another Code.
Craig L. Prahl, CET
Fire Protection Group
Mechanical Department
CH2MHILL
Lockwood Greene
1500 International Drive
PO Box 491, Spartanburg, SC 29304-0491
Direct - 864.599.4102
Fax - 864.599.8439
[EMAIL PROTECTED]
http://www.lg.com
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