Page 2 - With that in mind, this guide is constructed in three sections.; Section One; describes how to select a fan using catalog; Section Two; covers the basics of fan selection—determining; Section Three; goes beyond fan selection with information; SELECTING THE RIGHT FAN FOR THE JOB
This book is designed to help you select the fan that will bestfit the application for which it is intended. With the largenumber of different fan types and sizes available it'snecessary to know which fan model does the best job incertain applications and then be able to select the mosteconomical fa...
Page 3 - TABLE OF CONTENTS; SECTION 1; INTRODUCTION TO FAN SELECTION; SECTION 2; FAN SELECTION BASED ON FAN APPLICATION; SECTION 3; FAN PERFORMANCE
TABLE OF CONTENTS SECTION 1 INTRODUCTION TO FAN SELECTION Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Model Designation . . . . . . . . . . . . . . . . . . . . . .4 Reading Performance Charts . . . . . . . . . . . . . .5 Matching a Specification . . . . . . . . . . . . . ....
Page 4 - Model Designation; Terms
This is the first and most basic of this manual’s threesections, all of which are designed to enable you toselect the right fan for the job. Look at this first sectionas a “user’s manual” for Greenheck literature. It willanswer the following questions (and more): What is aSONE? How are model numbers...
Page 5 - Table 2
Reading Performance Charts Assume that a job requires a belt drive roof exhausterto move 1000 cfm against 0.25 in. Ps. Refer to theperformance model at the bottom of this page. Start atthe top of the chart with the 0.25 in. Ps column. (Allnumbers in this column correspond to .25 in. Ps.) Nowfollow t...
Page 6 - Direct Drive Selection; Motor Enclosure; Accessories
Model Common Accessories Roof Curb G & GB Backdraft Damper Roof Curb CUBE Grease Trap SB Wall Mount Housing orWall Mount Collar Model Common Accessories Speed Control SP & CSP Discharge Vents Backdraft Damper SQ & BSQ Vibration Isolators One advantage of choosing the GB-101-4-R2 over the...
Page 7 - Model RSF and BCF Selection; Matching a Specification
Model RSF and BCF Selection The RSF and BCF selection charts are different from allother selection charts. For these models, the cfmvalues are at the left side of the chart in a single columnand the rpms are in the performance boxes. It is just theopposite for other models. The reason for this is th...
Page 8 - Cross Reference Chart; Competitor Model Number Deciphering Hints
Cross Reference Chart (Models in italics refer to older models) Direct Drive120 W 10 D Direct Drive rpm x 100 Model ACW Wheel Size Belt Drive150 V 6 B Belt Drive 3/4 hp Model VCR Wheel Size = 15 in. Direct DrivePW 135 A 8 860 rpm 1/20 hp Wheel Size =13.5 in. Model PW Belt DrivePNN 163 G 1/2 hp Wheel...
Page 9 - Direct Drive vs Belt Drive; Fan Model
FAN SELECTION BASED ON FAN APPLICATION Direct Drive vs Belt Drive Direct drive fans are economical for low volume (2000cfm or less) and low static pressure (0.50 in. or less).They require little maintenance and most direct drivemotors can be used with a speed control to adjust thecfm. Belt drive fan...
Page 10 - Commercial Kitchen Ventilation
Recommended Exhaust Fans Commercial Kitchen Ventilation Model CUBE Model USGF Model CWB Model SWB Belt Drive Belt Drive Belt Drive Belt Drive Upblast Roof Exhaust Upblast Roof Exhaust Sidewall Exhaust Utility Blower 300-30,000 cfm 300-7,000 cfm 300-12,000 cfm 500-30,000 cfm Up to 5.0 in. wg Up to 3 ...
Page 11 - Fan Sizing; Exhaust
Commercial Kitchen Ventilation Fan Sizing Exhaust When not specified by local codes, the following guidelines may be usedto determine the minimum kitchen hood exhaust cfm. Some local codesrequire 100 cfm/ft. 2 of hood area for wall style hoods. Supply Recommended supply airflow is 90% ofexhaust cfm....
Page 12 - General Commercial Ventilation
General Commercial Ventilation Models SQ and BSQ are versatilefans that can be used for exhaustor supply and can be mounted inany position. Two removable sidepanels provide access for service. Model G Direct Drive Roof Exhaust90-3,200 cfmUp to 1.0 in. wg Model GB Belt Drive Roof Exhaust80-44,700 cfm...
Page 13 - Typical Commercial Ventilation Installations
Page 14 - General Industrial Ventilation; Typical Applications
General Industrial Ventilation Typical Applications Propeller fans are ideal for ventilating high air volumes at low static pressures (0.50 in. or less). Industrialapplications often include factories and warehouses. A variety of fan models offer flexibility for roof or wall mountas well as exhaust ...
Page 15 - High Static Pressure Ventilation
High Static Pressure Ventilation Typical Applications Models SWB and BSQ are general, all-purpose fans that are capable of moving high air volumesagainst high static pressures (up to 5.0 in wg). High static pressures are generated by long or complexduct systems, especially when capture hoods are pre...
Page 16 - Suggested Air Changes for Proper Ventilation
Area Min./Chg. Area Min./Chg. Area Min./Chg. Assembly Hall 3-10 Dance Hall 3-7 Machine Shop 3-6 Attic 2-4 Dining Room 4-8 Mill 3-8 Auditorium 3-10 Dry Cleaner 2-5 Office 2-8 Bakery 2-3 Engine Room 1-3 Packing House 2-5 Bar 2-4 Factory 2-7 Projection Room 1-2 Barn 12-18 Foundry 1-5 Recreation Room 2-...
Page 17 - STATIC PRESSURE GUIDELINES; Ductwork
Determining Static Pressure (Ps) The pressures generated by fans in ductwork are very small.Yet, accurately estimating the static pressure is critical toproper fan selection. Fan static pressure is measured in inches of water gauge.One pound per square inch is equivalent to 27.7 in. of watergauge. S...
Page 19 - Suggested Limits for Room Loudness
Motor Horsepower The motor horsepower for direct drive fans is alwayssized by Greenheck and does not require furtherconsideration. For belt drive models, the catalogidentifies which horsepower is recommended.However, there are times when it is wise to bump thehorsepower one size. For example, the hp...
Page 20 - Uniform Flow
Installation To ensure proper fan performance as cataloged,caution must be exercised in fan placement andconnection to the ventilation system. Obstructions,transitions, poorly designed elbows, improperly selected dampers, etc., can cause reducedperformance, excessive noise, and increasedmechanical s...
Page 21 - System Dynamics; Fan Curve
FAN PERFORMANCE System Dynamics For a given flow rate (cfm), an air distribution systemproduces a resistance to airflow (Ps). This resistance isthe sum of all static pressure losses as the air flowsthrough the system. Resistance producing elementsinclude ductwork, dampers, grills, coils, etc. A fan ...
Page 22 - Combining Fan and System Dynamics; System Resistance Curve
Combining Fan and System Dynamics The previous two sections introduced fan curves andsystem resistance curves. This section will show howthese relate to each other to provide an understandingof the way the fan-system operates as a completeentity. Remember that a fan curve is the series of points atw...
Page 23 - Adjusting Fan Performance; Operating Point
Adjusting Fan Performance There is a direct relationship between cfm and rpmwithin a system. Doubling the fan rpm will double thecfm delivered. Sample problem: The figure on page 21 showed a fan curve at 700 rpmwhich had an operating point of 1000 cfm at 0.25 in. Ps.What rpm is required to move 2000...
Page 24 - Fan Laws
In a steady-state system, as the fan rpm changes, cfm, Psand BHp (horsepower) also change. The equations below,known better as fan laws, show the relationship betweenthese performance parameters. cfm New = rpm New x cfm Old rpm Old Ps New = ( rpm New ) 2 x Ps Old rpm Old Bhp New = ( rpm New ) 3 x Bh...
