ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 16
of ductwork allows for a uniform
In addition to ef fective duct
the opposite direction of the fan's
velocity profile. Note that at approxi-
length, the placement and direc-
rotation, the loss will be even greater.
mately 50 percent of effective duct
tion of elbows is significant at a fan's
When a design requires the instal-
length the fan achieves approxi-
outlet. An elbow installed too close to
lation of an elbow, a minimum of
mately 80 percent of its pressure
the outlet will result in a significant
two to three duct lengths is recom-
regain.
loss of airflow. If the elbow turns in
mended to allow the velocity profile
of air exiting the fan to develop across
the ductwork.
CONSTANT VOLUME REGULATORS
Conclusion
By and large, most fan-performance
deficiencies are the result of improper
system design. This is because fans
are simple, standard mechanical
devices, while systems are complex
and unique, with many installation
variables that can adversely impact
performance.
When designing a fan system
for optimal operation, remember
to allow enough room for needed
accessories and appropriate ducting
connecting the fan to the larger
CVR
CVR-FD
CVR-GM
system. The long-term cost savings
will be worth the extra effort upfront.
The Nailor Constant Volume Regulator (CVR) is an extremely cost-effective way to
Additionally, because fan installa-
precisely control the airflow in HVAC systems - especially high-rise buildings (such
tions are so customized, it is impor-
as exhaust shafts) - without the need for controls or sensors. The CVR is a pressure
tant to partner with a knowledgeable
independent self-regulating damper which adjusts to maintain a constant set airflow.
The CVR-FD Fire Damper model is a sleeve/register box assembly available for
supply or return applications. It consists of the CVR, a UL 555 Listed 1 ½ hour static
or dynamic curtain fire damper and an optional grille. This labor saving model is
complete, requires no rear retaining angles and reduces installation time.
The CVR-GM Grille Mount model is a register box assembly consisting of the CVR
and an optional grille where a fire damper is not required.
* Automatically responds to Varying Duct Pressures
* CVR Models for Standard, Low and High Pressure Applications
* Minimizes Building Stack Effect
* Conserves Energy
and experienced vendor to ensure
optimum system performance, efficiency, and longevity.
About the Author
Mike Humann is manager of products
and applications for The New York
Blower Co. During his 10-year career,
he has presented at conferences and
conducted training sessions on topics
including system effect, fan applications, and custom fan modifications. He has a bachelor's degree
nailor.com
with a concentration in physics from
Elmhurst University.
16
2020 A M CA i n m o t i o n
w w w. a m c a .o r g
http://www.nailor.com
http://www.amca.org
ASHRAE Journal Supplement - AMCA InMotion - October 2020
Table of Contents for the Digital Edition of ASHRAE Journal Supplement - AMCA InMotion - October 2020
Contents
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - BB1
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - BB2
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - Cover1
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - Cover2
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - Contents
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 2
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 3
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 4
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 5
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 6
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 7
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 8
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 9
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 10
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 11
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 12
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 13
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 14
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 15
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 16
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 17
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 18
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 19
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 20
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 21
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 22
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 23
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 24
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 25
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 26
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 27
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 28
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 29
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 30
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 31
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 32
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 33
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 34
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 35
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 36
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 37
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 38
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 39
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 40
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 41
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 42
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 43
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 44
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - Cover3
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - Cover4
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