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Fan Selection
Application-Based Selection
Performance Theory
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SELECTING THE RIGHT FAN FOR THE JOB This book is designed to help you select the fan that will best fit the application for which it is intended. With the large number of different fan types and sizes available it's necessary to know which fan model does the best job in certain applications and then be able to select the most economical fan size for the job. With that in mind, this guide is constructed in three sections. Section One describes how to select a fan using catalog performance tables
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TABLE OF CONTENTS SECTION 1 INTRODUCTION TO FAN SELECTION Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Model Designation . . . . . . . . . . . . . . . . . . . . . .4 Reading Performance Charts . . . . . . . . . . . . . .5 Matching a Specification . . . . . . . . . . . . . . . . .7 Cross Reference Chart . . . . . . . . . . . . . . . . . . .8 SECTION 2 FAN SELECTION BASED ON FAN APPLICATION Basic Overview. . . . . . . . . . . . . . . . . . . . . . . . .9 Commercial Kitche
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INTRODUCTION TO FAN SELECTION This is the first and most basic of this manual’s three belt driven fans different? What types of motors and sections, all of which are designed to enable you to accessories are used with these fans? Are there select the right fan for the job. Look at this first section Greenheck fans that will match the size and as a “user’s manual” for Greenheck literature. It will performance of fans from other manufacturers? The answer the following questions (and more): What i
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Reading Performance Charts The most important part of selecting a fan is the ability exceptions to this rule. The selection procedure for to read the performance charts. Most of the these models is handled separately. Direct drive and performance charts in the catalog are similar and are belt drive fans are also addressed separately. read in the same manner. Models RSF and BCF are Belt Drive Selection Assume that a job requires a belt drive roof exhauster At this point, the sone value is 7.9 and
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One advantage of choosing the GB-101-4-R2 over the GB-101-4-R1 is that it is capable of running at higher rpm’s, which enables the fan to move more air if necessary. Motor pulleys are adjusted by loosening the set screw Belt and turning the top half of the pulley (see illustrations at right). This causes the pulley diameter to change, which results in changing the fan rpm. Opening the pulley decreases fan rpm. Closing the pulley increases fan rpm. 2. Models CUE and CW, sizes 060-095 and Model SQ
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Matching a Specification There will be times when a Greenheck model will have the left to determine which Greenheck model is to be matched to a competing manufacturer’s unit. To equivalent. Once this is determined, refer to the aid in these circumstances, we have provided a cross Greenheck catalog to find the best size to meet the reference chart which includes our nine most common specified performance. competitors. If the manufacturer you need is not on this Hint: Typically, when matching a Gr
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Cross Reference Chart (Models in italics refer to older models) Jenn Cook COOLAIR AirMaster Captive Aire Penn Acme (Breidert) Carnes Greenheck Updated 12-7-2004 (ILG) (Chelsea) (Flow Air) (Stanley) G ACED Domex DX PRN CRD VEDK CRD CDD DR CE,CX,CH C-D,CVD,TCD XQ,XR,AT,AW VEDB,VEDC RDD GB ACEB Domex DXB PN,PNN,PV NBCR VEBK CRB CBD DD CDE, CBX C-B,TCB,UCB KB,JB,MB,AB,LB BCR VEBC LSB RDB CUE ACRUD, VCRD Fumex FX PDU n/a VUDK CUD, UBD n/a DU CUBE ACRUB,VCR Fumex FXB PNU NBTD VUBK,VRBK UBC,CUB CBU NCA
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FAN SELECTION BASED ON FAN APPLICATION Basic Overview Ventilating a building simply replaces stale or foul air Fan specification is usually not a precise science and with clean, fresh air. Although the ventilation process is can be done confidently when the fan application is required for many different applications, the airflow understood. fundamentals never change: Based on the application, four parameters need to be Undesired air out, fresh air in determined. They are: The key variables that
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Commercial Kitchen Ventilation Recommended Exhaust Fans 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 in. wg Up to 2.75 in. wg Up to 5.0 in. wg The above models are designed for exhausting dirty or grease laden air up and away from the roof line or away from the wall in commercial restaurant applicati
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Commercial Kitchen Ventilation This drawing shows a commercial kitchen with a typical kitchen ventilation system consisting of a roof mounted CUBE upblast exhaust fan and a Model RSF supply fan. Exhaust fan variations include the model CWB sidewall exhaust fan (also shown) when penetrating the roof is not practical. The Model SWB utility blower is recommended when higher static pressure capability is required to pull exhaust through long duct runs (typically 3 stories or more). Fan Sizing Exh
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General Commercial Ventilation Model G Model CW Direct Drive Roof Exhaust Direct Drive Wall Exhaust 90-3,200 cfm 80-6,000 cfm Up to 1.0 in. wg Up to 2.25 in. wg Model GB Model CWB Belt Drive Roof Exhaust Belt Drive Wall Exhaust 80-44,700 cfm 300-12,000 cfm Up to 3.25 in. wg Up to 2.75 in. wg The above models are designed for exhausting relatively clean air at temperatures up to 130°F. Motors are out of the airstream. Direct drive sizes 60-95 are equipped with 3-speed motors for maximum airflow f
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Typical Commercial Ventilation Installations 13
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General Industrial Ventilation Model SB Belt Drive Propeller Sidewall 3,600-85,000 cfm Up to 1.0 in. wg Model RBU Belt Drive Propeller Upblast Model RBUMO 4,000-65,000 cfm Belt Drive Up to 1.0 in. wg Propeller Upblast 3,000-60,000 Up to 1.0 in. wg Model RB RBS-Supply RBE-Exhaust RBF-Filtered Belt Drive Propeller Roof 2,000-86,500 cfm Up to 1.5 in. wg Typical Applications Propeller fans are ideal for ventilating high air volumes at low static pressures (0.50 in. or less). Industrial applications
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High Static Pressure Ventilation Model SWB Belt Drive Utility Blower 500-30,000 cfm Temperatures up to 400°F Up to 5.0 in. wg Model BSQ Belt Drive Inline Fan 150-28,000 cfm Temperatures up to 180°F Up to 4.0 in. wg Typical Applications Models SWB and BSQ are general, all-purpose fans that are capable of moving high air volumes against high static pressures (up to 5.0 in wg). High static pressures are generated by long or complex duct systems, especially when capture hoods are present. Both model
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Determining CFM (cfm) After the model is known, the cfm must be determined. climates and heavier than normal area usage, select a Consult local code requirements or the table below for lower number in the range to change the air more suggested air changes for proper ventilation. quickly. For moderate climates with lighter usages, select a higher number in the range. The ranges specified will adequately ventilate the corresponding areas in most cases. However, extreme To determine the cfm require
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Determining Static Pressure (Ps) The pressures generated by fans in ductwork are very small. Exhaust Fan Yet, accurately estimating the static pressure is critical to proper fan selection. Fan static pressure is measured in inches of water gauge. One pound per square inch is equivalent to 27.7 in. of water gauge. Static pressures in fan systems are typically less than 2 in. of water gauge, or 0.072 Psi. The drawing to the right illustrates how static pressures are measured in ductwork with a ma
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Preliminary Selections selecting near the maximum rpm of a size to allow for At this point we know the model, cfm and Ps. With this final adjustments if necessary. information we can refer to the GB performance charts to determine the sizes available to move 2400 cfm There are four GB sizes to choose from in the QD against 0.50 in. Ps. catalog. These sizes along with their performance data In our case, all of the criteria can be met by more than are in the table below. one size of a particular m
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Sound Levels In many cases, the sound generated by a fan must be Suggested Limits for Room Loudness considered. For the fan industry, a common unit for Sones DBA expressing sound pressure level is the sone. In practical terms, the loudness of one sone is equivalent 1.3-4 32-48 Private homes (rural and suburban) to the sound of a quiet refrigerator heard from five feet 1.7-5 36-51 Conference rooms away in an acoustically average room. 2-6 38-54 Hotel rooms, libraries, Sones are a linear measureme
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Installation To ensure proper fan performance as cataloged, selected dampers, etc., can cause reduced caution must be exercised in fan placement and performance, excessive noise, and increased connection to the ventilation system. Obstructions, mechanical stressing. For the fan to perform as transitions, poorly designed elbows, improperly published, the system must provide uniform and stable airflow into the fan. Uniform Flow Improperly sized or Elbow too close obstructed damper to fan inlet Wh
