ASHRAE Journal Supplement - AMCA InMotion - November 2022 - 14
PHOTO A. Framing of an opening in a fi re-rated
wall. Photograph courtesy of TAMCO
Single-use devices, fusible links consist of two strips
of metal soldered together (Photo B). When the solder
reaches a specifi c temperature (typically, 165°F [74°C] or
212°F [100°C]), it melts, and the two strips of metal separate,
enabling a damper to close.
A thermostat (Photo C) is a bimetal thermal disc
designed to cut power to an electric damper actuator
when a specifi c air temperature (typically, 165°F [74°C],
212°F [100°C], 250°F [121°C], or 350°F [177°C]) is reached.
Many thermostats can be reset in the fi eld once a damper
has been inspected and found to
be free of damage.
Do building codes explain
how to install fi re, smoke,
and combination fi re/smoke
dampers? Model codes refer
to manufacturer installation
instructions and damper listings.
Though many manufacturers'
installation instructions
are similar, the differences,
however slight, may be important.
Therefore, be sure to review
the instructions for the specifi c
damper to be installed.
How do I know whether
I need a smoke damper
14
2022 AMCA inmot ion
PHOTO B. Fusible links. Photograph courtesy of TAMCO
with a leakage rating of Class I or one with a
leakage rating of Class II? Consult your local codes
for leakage requirements. If your local codes do not
specify a minimum leakage for your application, then
refer to the national codes.
For most applications, a minimum leakage rating of
Class II is required. Class II leakage means a damper
was tested and is approved to leak less than 20 cfm per
square foot at 4.0 in. wg (102 l/s/m2 at 1.0 kPa).
For applications such as hospitals, schools, and
stairwells, a leakage rating of
Class I is required. Class I leakage
means a damper was tested and
is approved to leak less than 8
cfm per square foot at 4.0 in. wg
(40 l/s/m2 at 1.0 kPa).
If a leakage rating is not specifi
ed, the designer will need to
determine how tight a penetration
should be sealed during a
fi re event.
PHOTO C. Thermostat wiring box with
reset button. Photograph courtesy of Pottorff
Design/Installation/
Controls
How do you replace an old
pneumatic actuator with a
new electric model? Locate
the damper's control shaft. If the
pneumatic actuator is mounted
www.amca.org
http://www.amca.org
ASHRAE Journal Supplement - AMCA InMotion - November 2022
Table of Contents for the Digital Edition of ASHRAE Journal Supplement - AMCA InMotion - November 2022
ASHRAE Journal Supplement - AMCA InMotion - November 2022 - CT1
ASHRAE Journal Supplement - AMCA InMotion - November 2022 - CT2
ASHRAE Journal Supplement - AMCA InMotion - November 2022 - Cover1
ASHRAE Journal Supplement - AMCA InMotion - November 2022 - Cover2
ASHRAE Journal Supplement - AMCA InMotion - November 2022 - 1
ASHRAE Journal Supplement - AMCA InMotion - November 2022 - 2
ASHRAE Journal Supplement - AMCA InMotion - November 2022 - 3
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ASHRAE Journal Supplement - AMCA InMotion - November 2022 - Cover3
ASHRAE Journal Supplement - AMCA InMotion - November 2022 - Cover4
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