ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 22

considered. Leakage is expressed as the volume of air
through a damper per square area of damper at a specifi c
static pressure for a given closing torque in the closed
position. Control dampers with excessive air leakage
reduce system effi ciency, requiring system fans to work
harder to compensate, resulting in wasted fan energy.
This wasted energy increases operational costs and
can have a negative effect on the performance of other
HVAC equipment.
To achieve the lowest leakage ratings, blade-edge and
Opposed-blade galvanized-steel
control damper.
jamb seals typically are employed. A variety of seal materials,
some more suitable for specifi c application requirements
than others, are available. General-purpose seals
constructed of polyvinyl chloride (PVC) and similar materials
provide adequate leakage characteristics and performance
at temperatures up to 140°F to 180°F (60°C to 82°C).
For more stringent applications, where temperatures can
fl uctuate from -50°F to -70°F (-46°C to -57°C) and 200°F to
250°F (93°C to 121°C), silicone and ethylene-propylenediene-monomer
(EPDM) rubber seals can be utilized.
The compression requirement for tight shutoff varies
Parallel-blade extruded-aluminum
control damper.
based on seal material, which will affect the torque requirements
for operating a damper. Dampers with stainlesssteel
jamb seals can have a higher torque requirement for
opening and closing than dampers with silicone or EPDM
jamb seals, possibly resulting in the need for an actuator
with a higher torque rating. Larger torque-rated actuators
consume more energy and cost more. Seals made with
silicone and EPDM tend to have a longer service life than
seals made with other materials.
Air-leakage testing usually is conducted in accordance
with ANSI/AMCA Standard 500-D. The maximum
allowable leakage is defi ned in AMCA Publication 511,
Certifi ed Ratings Program Product Rating Manual for Air
Control Devices (Table 1).
Thermal effi ciency. Typically constructed of extruded
Insulated control damper with
thermally broken blades and
frame. Above photographs courtesy of
Greenheck Fan Corp.
22
2021 AMCA inmot ion
aluminum, with blades and a frame featuring a thermal
break component and insulation enabling performance in
extremely cold environments, thermally effi cient dampers,
also known as thermal break dampers, provide extremely
low leakage as well as exceptional air control in mediumto-high-pressure-and-velocity
applications. Thermally
efficient dampers reduce or eliminate the transfer of
heat and cold and lessen the potential for condensation.
www.amca.org
http://www.amca.org

ASHRAE Journal Supplement - AMCA InMotion - November 2021

Table of Contents for the Digital Edition of ASHRAE Journal Supplement - AMCA InMotion - November 2021

Contents
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - BB1
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - BB2
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Cover1
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Cover2
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Contents
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 2
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 3
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 4
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 5
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 6
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 7
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 8
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 9
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 10
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 11
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 12
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 13
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 14
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 15
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 16
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 17
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 18
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 19
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 20
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 21
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 22
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 23
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 24
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 25
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 26
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 27
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 28
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 29
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 30
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 31
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 32
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 33
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 34
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 35
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 36
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 37
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 38
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 39
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 40
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 41
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 42
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 43
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 44
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Cover3
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Cover4
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