INTRODUCTION TO FAN SELECTION
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.
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.
Model Designation
For Greenheck belt drive models, the model designation tells the model type, size and the motor hp.
The table below lists model designation suffixes for motor horsepower and fan rpm.
EXAMPLE:
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: | |||||
Model is G |
|
|
|
| rpm is 1140 |
|
| ||||
|
|
|
|
|
|
Nominal Wheel Dia. 12 in.
4
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 | 11/2 | F | 680 |
20 | 2 | P | 1625 |
30 | 3 |
|
|
50 | 5 |
|
|
75 | 71/2 |
|
|
