ASHRAE Journal - September 2014 - 11
LETTERS
basis of why these "other" code authorities having jurisdiction (AHJ) would not allow this installation. Obviously,
extending the shaft down into the ceiling space of the next
level increases construction costs that may not be needed
if these "other" AHJs are enforcing an installation that the
standards and codes don't require. Is there something
in the UL testing of products that would support this
interpretation?
Therefore, I feel the arrangement is permissible;
nonetheless, when an AHJ interprets otherwise, our
practice is to extend the shaft into the ceiling cavity
of the next lower floor level and enter/exit the vertical walls of the shaft only, with appropriate rated
dampers.
Stephen Duda, Fellow ASHRAE, St. Louis
Steve Liescheidt, P.E., Member ASHRAE,
Chesterfield, Mo.
The Author Responds
My statement that some AHJs will
not accept a horizontal fire/smoke
damper at the base of a shaft not
extending to the bottom of a building
is based on personal experience. IBC
2012 ¶713.11 discusses enclosures of a
shaft at the bottom (the same clause
appears at ¶708.11 of the IBC 2009).
Some AHJs have interpreted that a
horizontal fire/smoke damper at the
base of the shaft is not the structural
equivalent of a two-hour floor slab
base, and some cite a 2000 Formal
Interpretation (#2/710/00) of a very
similar but now-obsolete 1999 BOCA
Code clause not allowing a rated
damper on the horizontal underside of a shaft bottom. Other AHJs
disregard the Formal Interpretation
because BOCA has been superseded
by the IBC, and because they feel IBC
2012 ¶713.11 does indeed permit the
arrangement.
In fact, the 2012 IBC
"Commentary" edition's editorial
text accompanying IBC 2012 ¶713.11
seems to imply that the arrangement
is permissible, stating "Exception
3... allows a fire damper to be provided at the bottom of the enclosure. Please note that this method
predates the requirement for both
smoke and fire dampers in ducts
penetrating shaft walls (Section
717.5.3). The code user must comply
with both code sections; therefore,
the code user must provide both
fire and smoke dampers with this
method...."
www.info.hotims.com/49808-30
SEPTEM BER 2014
ashrae.org
ASHRAE JOURNAL
11
ASHRAE Journal - September 2014
Table of Contents for the Digital Edition of ASHRAE Journal - September 2014
Contents
ASHRAE Journal - September 2014 - Cover1
ASHRAE Journal - September 2014 - Cover2
ASHRAE Journal - September 2014 - 1
ASHRAE Journal - September 2014 - 2
ASHRAE Journal - September 2014 - Contents
ASHRAE Journal - September 2014 - 4
ASHRAE Journal - September 2014 - 5
ASHRAE Journal - September 2014 - 6
ASHRAE Journal - September 2014 - 7
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ASHRAE Journal - September 2014 - SCover1
ASHRAE Journal - September 2014 - SCover2
ASHRAE Journal - September 2014 - S1
ASHRAE Journal - September 2014 - S2
ASHRAE Journal - September 2014 - S3
ASHRAE Journal - September 2014 - S4
ASHRAE Journal - September 2014 - S5
ASHRAE Journal - September 2014 - S6
ASHRAE Journal - September 2014 - S7
ASHRAE Journal - September 2014 - S8
ASHRAE Journal - September 2014 - S9
ASHRAE Journal - September 2014 - S10
ASHRAE Journal - September 2014 - S11
ASHRAE Journal - September 2014 - S12
ASHRAE Journal - September 2014 - S13
ASHRAE Journal - September 2014 - S14
ASHRAE Journal - September 2014 - S15
ASHRAE Journal - September 2014 - S16
ASHRAE Journal - September 2014 - S17
ASHRAE Journal - September 2014 - S18
ASHRAE Journal - September 2014 - S19
ASHRAE Journal - September 2014 - S20
ASHRAE Journal - September 2014 - S21
ASHRAE Journal - September 2014 - S22
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ASHRAE Journal - September 2014 - Cover3
ASHRAE Journal - September 2014 - Cover4
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