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This is the first and most basic of this manual’s three
sections, all of which are designed to enable you to
select the right fan for the job. Look at this first section
as a “user’s manual” for Greenheck literature. It will
answer the following questions (and more): What is a
SONE? How are model numbers and performance
tables used to select a fan? How are direct drive and
belt driven fans different? What types of motors and
accessories are used with these fans? Are there
Greenheck fans that will match the size and
performance of fans from other manufacturers? The
goal is to understand and use the Greenheck literature
as an important tool in filling a customer’s fan order.
Model Designation
For Greenheck belt drive models, the model
designation tells the model type, size and the motor hp.
EXAMPLE: GB-090-6
Model is GB hp is 1/6
Nominal Wheel Dia. 9 in.
For direct drive units, the model designation tells the
model type, the size and the motor/fan rpm.
EXAMPLE: G-121-B
Model is G rpm is 1140
Nominal Wheel Dia. 12 in.
The table below lists model designation suffixes for
motor horsepower and fan rpm.
Belt Drive
Direct Drive
Suffix Motor hp Suffix Fan rpm
6
1
/6 A 1725
4
1
/4 B 1140
3
1
/3 C 860
5
1
/2 D 1550
7
3
/4 G 1300
10 1 E 1050
15 1
1
/2 F 680
20 2 P 1625
30 3
50 5
75 7
1
/2
Terms
cfm - Cubic Feet Per Minute. A measure of airflow.
Ps - Static Pressure. Resistance to airflow measured in inches of water gauge.
sone - A measure of loudness. One sone can be approximated as the loudness of a quiet
refrigerator at a distance of 5 feet. Sones follow a linear scale, that is, 10 sones are
twice as loud as 5 sones.
Bhp - Brake Horsepower. A measure of power consumption. Used to determine the proper
motor horsepower and wiring.
hp - Horsepower. Used to indicate a fan’s motor size.
rpm - Revolutions Per Minute. Measure of fan speed.
TS - Tip Speed. The speed of the tip of a fan wheel or prop measured in feet per minute.
AMCA - Air Movement and Control Association. A nationally recognized association which
establishes standards for fan testing and performance ratings. AMCA also licenses air
volume and sound certified ratings.
INTRODUCTION TO FAN SELECTION
4