Engineering Data

Selection

The first consideration in any fan selection is the amount of air to be moved and the resistance to this air movement. Air volume requirements are established through specific codes or accepted industry standards. Once the air volume is known, system resistance can be determined by summing up the losses through the system components. Duct layout, duct size, coils, filters, dampers, and fan accessories all affect system resistance. ASHRAE Guide and Data Books and manufacturer’s data on individual system components are common sources of information available to the system designer.

In most applications, several fans may meet the required airflow and system resistance conditions. An optimum fan selection requires evaluation of alternative fan types and fan sizes, as they relate

to initial cost, operating cost, available space, and allowable sound levels. The relative importance of these facts varies with each system.

Two types of wheels are available:

1.Backward-inclined or airfoil wheels turn at twice the speed of forward- curved fans and feature:

Higher operating efficiencies

A non-overloading horsepower curve which reaches a peak near the middle of the normal operation range

Stronger wheel design allowing for operation at higher static pressures

2.Forward-curved wheels typically have lower performance capabilities compared to the backward inclined and contain:

Overloading type wheel (meaning that changes in performance can result in significant brake horsepower changes)

Forward-curved wheels have lower sound levels

Comprehensive air performance data for these utility fans can be found in the fan tables and fan curves section, starting on page 15.

10

Effects of Installation on Performance

Fan ratings presented in the performance tables and curves of this catalog are in accordance with AMCA Standard 210 “Laboratory Methods of Testing Fans for Aerodynamic Performance Rating.” The AMCA test procedure utilizes an open inlet and a straight outlet duct to assure maximum static regain.

Any installation with inlet or discharge configurations that deviate from this standard may result in reduced fan performance. Restricted or unstable flow at the fan inlet can cause pre rotation of incoming air or uneven loading of the fan wheel yielding large system losses and increased sound levels. Free discharge or turbulent flow in the discharge ductwork will also result in system effect losses.

The examples below show system layouts and inlet and discharge configurations which can affect fan performance.

 

 

7o MAX.

POOR

FAIR

GOOD

POOR

POOR

FAIR

 

Turning

One

 

Impeller

 

Varies

 

Dia.

 

 

 

 

Should be at least

 

 

1/2 Impeller Dia.

POOR

FAIR

GOOD

POOR

FAIR

GOOD

 

 

Not Greater than

 

 

60o Including Angle

POOR

POOR

FAIR

Page 10
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Greenheck Fan SFD, SWB, SFB manual Engineering Data, Selection

SWB, SFD, SFB specifications

Greenheck Fan’s SFB, SFD, and SWB series represent advanced solutions in ventilation technology, designed to cater to a variety of commercial and industrial applications. Each series brings unique features and optimizations that enhance airflow efficiency and reliability, making them suitable for schools, warehouses, and manufacturing facilities.

The SFB series stands out with its durable construction and high-performance capabilities. These fans are engineered for direct drive applications, offering quieter operation and lower maintenance compared to belt-driven alternatives. The SFB series features efficient backward-inclined airfoil blades, which minimize energy consumption while maximizing airflow. Additionally, they are designed with an innovative airflow path that reduces turbulence and improves overall performance.

In contrast, the SFD series is intended for applications requiring high static pressure capabilities. It incorporates a special housing design that allows for increased efficiency in high-pressure environments. The advanced motor technology in the SFD series contributes to significant energy savings, while the unit's adjustable pitch blades ensure optimal performance across various operating conditions. These fans are particularly popular in commercial kitchen exhaust systems, where effective removal of smoke and odors is critical.

The SWB series, meanwhile, is specifically designed for sidewall applications, making it a versatile option for residential and light commercial use. The SWB fans feature a compact design that facilitates easy installation in tight spaces, and their weather-resistant construction ensures reliable performance even in challenging outdoor conditions. Additionally, these fans utilize energy-efficient motor designs that further contribute to their low operational costs.

All three series prioritize user-friendly operation and maintenance. They are equipped with standard access panels that provide easy interior access for cleaning and servicing, thereby extending the lifespan of the equipment. Greenheck also emphasizes noise reduction in its designs, employing sound-dampening technologies and vibration isolation features to ensure a quieter operation.

In conclusion, Greenheck Fan’s SFB, SFD, and SWB series represent a commitment to innovation in ventilation technology. Their distinctive characteristics, including energy efficiency, durability, and ease of maintenance, make them ideal choices in a wide array of applications, from industrial to residential settings. With ongoing advancements in technology, Greenheck continues to set benchmarks in the industry, ensuring effective air movement solutions that align with modern sustainability demands.