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December 7, 2015
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Intermediate Temperature Sprinklers in Conditioned Spaces
"We are designing an apartment complex per NFPA 13 requirements. Is it
permissible
to install intermediate temperature sprinklers throughout all spaces (except
those
that would specifically require a high temp sprinkler due to other sections)?
The
specific question arises because we have ordinary temperature sprinklers
throughout
most areas, and intermediate temperature sprinklers in mechanical closets and
laundry
rooms in the dwelling units. The AHJ states that since the areas are
conditioned
spaces, that we must use ordinary temperature rated sprinklers. Is that
correct?"
We have reviewed NFPA 13, 2013 edition as the applicable standard. Our informal
interpretation is that intermediate temperature residential sprinklers can be
installed
throughout the premises.
Historically, the base requirement per Section 8.3.2.1 was to use an ordinary
temperature
rating throughout all buildings unless higher localized temperatures required a
higher rating. There was also the allowance to go to a high temperature rating
for extra hazard occupancies and storage. This was changed in the 2010 edition
whereby
one could also install sprinklers with an intermediate temperature rating
throughout
all facilities. This section says unless the requirements of 8.3.2.2, 8.3.2.3,
8.3.2.4, or 8.3.2.5 are met, ordinary- and intermediate-temperature sprinklers
shall
be used throughout buildings. The substantiation for this change in the 2009
Report
on Proposals in 13-125 Log #89 stated, "Many commercial facilities are omitting
a drop ceiling (simply painting the upper area black) and often installing many
HVAC diffusers. This has lead to some cases where 1/3 of the sprinklers have an
intermediate rating in order to satisfy Table 8.3.2.5(a). With standard
response
sprinklers a lower temperature rating makes sense. Now that quick response
sprinklers
are required, the difference in activation time between the two temperature
ratings
is not significant but the impact on installation is significant." The handbook
commentary for this section says that traditionally, ordinary-temperature
sprinklers
have been required throughout a building unless the requirements of 8.3.2
required
intermediate- or high-temperature sprinklers to be used. However, many
buildings
are built without suspended ceilings, resulting in a mix of ordinary with the
intermediate-temperature-rated
sprinklers needed around heating diffusers and other heat-producing areas.
Since
the response time of quick-response intermediate-temperature sprinklers is not
that
different from ordinary-temperature standard-response sprinklers, the standard
now
groups ordinary- and intermediate-temperature sprinklers together and allows
intermediate-temperature
sprinklers throughout the building, reducing the need for multiple types of
sprinklers.
Section 8.3.2.4 applies where sprinklers are installed in specific locations as
required by 8.3.2.5. The applicable portion for your installation would be
Section
8.3.2.5(8). Table 8.3.2.5(a) dictates the minimum temperature rating required
near
heat producing devices. It does not define the maximum rating. That is dictated
by Section 8.3.2.5.
Technical Update is prepared by the Technical Services Dept. of the AFSA: Vice
President
of Engineering and Technical Services Roland Huggins, a PE registered in fire
protection
engineering; Phill Brown, a NICET IV certified automatic sprinkler technician
and
NFPA Certified Fire Protection Specialist (CFPS) and Tom Wellen, a PE registered
in fire protection engineering. This is provided with the understanding that
the
AFSA assumes no liability for this opinion or actions taken on it and they are
not
to be considered the official position of the NFPA or its technical committees.
Copyright 2015, American Fire Sprinkler Association. All Rights Reserved
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