ASHRAE Journal - ACMA Supplement - Fall 2013 - 10

that clearly illustrate how to specify fan performance.
Another important decision that must be made by the fan specifier is the method of control to be used for the fan. Common
means of control are listed below, some of which can be
combined:
■ Outlet damper/system damper
■ Inlet box dampers
■ Variable inlet vanes
■ Variable speed or multiple speeds
■ Blade angle change.
Figure 2 illustrates common fan accessories used for fan control
in industrial process and power generation applications.
Figure 3: Model test of a rotor retrofit, where a fan wheel
made by one manufacturer was installed in an existing fan
casing made by a different fan manufacturer. In such cases,
it is common for the customer to specify that a model test be
done because the fan laws do not apply to such situations.
Image courtesy of FlaktWoods.

on the expected system curve, so the fan designer can select a
fan that is appropriate for all of these conditions. AMCA Publication 801 discusses these concepts and provides data sheets

Once provided with all of the required system performance
parameters, the fan designer can proceed to select a fan that is
appropriate. This is normally done using the laws of geometric
similitude, commonly referred to as the “Fan Laws,” as outlined
in AMCA 802.
These laws allow prediction of the performance of actual fans
from model fan data. The testing of model fans is the state-ofthe-art approach for determining fan performance. This testing
can be conducted in accordance with AMCA Standard 210 or

www.info.hotims.com/44636-12

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ASHRAE Journal - ACMA Supplement - Fall 2013

Table of Contents for the Digital Edition of ASHRAE Journal - ACMA Supplement - Fall 2013

Contents
ASHRAE Journal - ACMA Supplement - Fall 2013 - Cover1
ASHRAE Journal - ACMA Supplement - Fall 2013 - Cover2
ASHRAE Journal - ACMA Supplement - Fall 2013 - Contents
ASHRAE Journal - ACMA Supplement - Fall 2013 - 2
ASHRAE Journal - ACMA Supplement - Fall 2013 - 3
ASHRAE Journal - ACMA Supplement - Fall 2013 - 4
ASHRAE Journal - ACMA Supplement - Fall 2013 - 5
ASHRAE Journal - ACMA Supplement - Fall 2013 - 6
ASHRAE Journal - ACMA Supplement - Fall 2013 - 7
ASHRAE Journal - ACMA Supplement - Fall 2013 - 8
ASHRAE Journal - ACMA Supplement - Fall 2013 - 9
ASHRAE Journal - ACMA Supplement - Fall 2013 - 10
ASHRAE Journal - ACMA Supplement - Fall 2013 - 11
ASHRAE Journal - ACMA Supplement - Fall 2013 - 12
ASHRAE Journal - ACMA Supplement - Fall 2013 - 13
ASHRAE Journal - ACMA Supplement - Fall 2013 - 14
ASHRAE Journal - ACMA Supplement - Fall 2013 - 15
ASHRAE Journal - ACMA Supplement - Fall 2013 - 16
ASHRAE Journal - ACMA Supplement - Fall 2013 - 17
ASHRAE Journal - ACMA Supplement - Fall 2013 - 18
ASHRAE Journal - ACMA Supplement - Fall 2013 - 19
ASHRAE Journal - ACMA Supplement - Fall 2013 - 20
ASHRAE Journal - ACMA Supplement - Fall 2013 - 21
ASHRAE Journal - ACMA Supplement - Fall 2013 - 22
ASHRAE Journal - ACMA Supplement - Fall 2013 - 23
ASHRAE Journal - ACMA Supplement - Fall 2013 - 24
ASHRAE Journal - ACMA Supplement - Fall 2013 - 25
ASHRAE Journal - ACMA Supplement - Fall 2013 - 26
ASHRAE Journal - ACMA Supplement - Fall 2013 - 27
ASHRAE Journal - ACMA Supplement - Fall 2013 - 28
ASHRAE Journal - ACMA Supplement - Fall 2013 - Cover3
ASHRAE Journal - ACMA Supplement - Fall 2013 - Cover4
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