AMCA inmotion - Fall 2017 - 23
FEI
4 in. wg
RPM
BHP
5 in. wg
FEI
RPM
6 in. wg
FEI
BHP
RPM
FEI
BHP
Figure 2: Typical fire damper installation, based on AMCA
Publication 503.1 Image courtesy of Ruskin.
Figure 3: Example of a combination fire/smoke damper
with electric heat response device. Image courtesy of Ruskin.
in the airstream. Multi-blade fire dampers generally offer
greater restriction to airflow than a curtain-type fire damper
for the same size duct. However, multi-blade fire dampers can
be applied in situations when the system air velocities exceed
the curtain-type fire damper closure ratings. Multi-blade fire
dampers have been UL tested and are "dynamic" rated for
closure at a minimum 2,000 fpm and 4.0 in. w.g.
to create pressure differences. Pressurizing the areas surrounding the fire prevents the spread of smoke into other areas.
SMOKE DAMPERS
The definition for smoke dampers is similar to that of fire
dampers, with the difference being that these devices prevent
the passage of smoke through an HVAC system or from one
side of a leakage-rated separation to the other. Smoke dampers
are controlled by a smoke detection system and open or close
automatically. They can also be opened or closed from a
remote fire command station.
Smoke dampers are operated by a factory-installed electric
or pneumatic actuator. They are controlled by smoke detectors
and/or fire alarms. Smoke dampers are qualified under UL
Standard 555S, Standard for Smoke Dampers,2 and have two
general applications:
1. As part of a passive smoke control system, where they
close upon detection of smoke and prevent the circulation of
air and smoke through a duct, transfer or ventilation
opening.
2. As part of an "engineered smoke control system" designed
to control smoke migration using walls and floors as barriers
W W W. A M C A . O R G
COMBINATION FIRE/SMOKE DAMPERS
The codes have recognized - and most engineers agree
- that the best method of compartmentalization is through
the use of smoke and combination fire/smoke dampers.
Combination fire/smoke dampers close not only upon the
detection of high duct temperature but also upon the detection of smoke. They can be factory-supplied with override
controls to pressurize individual spaces. These dampers
are UL-leakage rated to stop smoke in its tracks, which is
their main difference from fire dampers. Only combination
fire/smoke dampers or stand-alone smoke dampers are
leakage-rated devices (Table 1).
Combination fire/smoke dampers (Figure 3) meet the
requirements of both UL standards for safety, UL 5553 and
Leakage
Classification
Leakage, cfm/sq-ft
at Standard Air Conditions
4.5 in. wg.
8.5 in. wg.
12.5 in. wg.
I
8
11
14
II
20
28
35
III
80
112
140
Table 1: Underwriters Laboratories'
Standard 555S Leakage Classifications.
A M C A I N T E R NAT I O NA L
inmotion
Fa l l 2 0 1 7
23
http://WWW.AMCA.ORG
Table of Contents for the Digital Edition of AMCA inmotion - Fall 2017
Contents
AMCA inmotion - Fall 2017 - BB1
AMCA inmotion - Fall 2017 - BB2
AMCA inmotion - Fall 2017 - Cover1
AMCA inmotion - Fall 2017 - Cover2
AMCA inmotion - Fall 2017 - Contents
AMCA inmotion - Fall 2017 - 2
AMCA inmotion - Fall 2017 - 3
AMCA inmotion - Fall 2017 - 4
AMCA inmotion - Fall 2017 - 5
AMCA inmotion - Fall 2017 - 6
AMCA inmotion - Fall 2017 - 7
AMCA inmotion - Fall 2017 - 8
AMCA inmotion - Fall 2017 - 9
AMCA inmotion - Fall 2017 - 10
AMCA inmotion - Fall 2017 - 11
AMCA inmotion - Fall 2017 - 12
AMCA inmotion - Fall 2017 - 13
AMCA inmotion - Fall 2017 - 14
AMCA inmotion - Fall 2017 - 15
AMCA inmotion - Fall 2017 - 16
AMCA inmotion - Fall 2017 - 17
AMCA inmotion - Fall 2017 - 18
AMCA inmotion - Fall 2017 - 19
AMCA inmotion - Fall 2017 - 20
AMCA inmotion - Fall 2017 - 21
AMCA inmotion - Fall 2017 - 22
AMCA inmotion - Fall 2017 - 23
AMCA inmotion - Fall 2017 - 24
AMCA inmotion - Fall 2017 - 25
AMCA inmotion - Fall 2017 - 26
AMCA inmotion - Fall 2017 - 27
AMCA inmotion - Fall 2017 - 28
AMCA inmotion - Fall 2017 - 29
AMCA inmotion - Fall 2017 - 30
AMCA inmotion - Fall 2017 - 31
AMCA inmotion - Fall 2017 - 32
AMCA inmotion - Fall 2017 - 33
AMCA inmotion - Fall 2017 - 34
AMCA inmotion - Fall 2017 - 35
AMCA inmotion - Fall 2017 - 36
AMCA inmotion - Fall 2017 - Cover3
AMCA inmotion - Fall 2017 - Cover4
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