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Industrial Exhaust Fan

OVERVIEW:

Industrial Exhaust Fan is really a generic term that could include any type of fan or blower. An industrial exhaust fan could be a Centrifugal type Blower or an Axial type Fan. What defines them as “Industrial” is the construction, materials and gauges. Centrifugal blowers differ from axial flow fans in the way they move the air. A centrifugal blower typically has one of seven types of wheels that draws the air into the inlet of the blower housing, through the wheel, and discharges it at 90 degrees out through the discharge of the housing. An axial flow fan uses a propeller to draw the air into it and discharges it in the same axial direction. An “air moving device” with a propeller is typically referred to as a Fan, while one with a wheel is typically referred to as a Blower. The deciding factor of whether to use a centrifugal blower or an axial fan depends on the application it will be used for.

To make the proper selection, you must consider the following conditions the fan will be subjected to:

1. What will be the mounting configuration of the industrial exhaust fan in the system?

2. What is the airflow that will be required?
This is rated in cubic feet of air per minute (CFM) or in metric equivalent, it is rated in cubic meters per hour (M³/Hr).

3. What is the static pressure through the complete system?
This is rated in static pressure water gauge (SPWG) or in metric equivalent, it is rated in Pascal’s (Pa). SPWG or Pa is the resistance to flow, or friction, caused by the air moving through a pipe or duct. Be sure to include losses through filters, dampers, etc.
NOTE: If the static pressure on the inlet side of the blower will exceed 15” SPWG, a
correction for suction pressure (Rarefication) should be made. For a definition of
rarefication and a suction pressure correction chart, see pages 6 and 7 of our Model HP-Series II catalog.

4. What is the ambient air temperature outside the exhaust fan?

5. What will be the airflow conditions through the fan?

  1. Clean or dirty (contaminated) air?
  2. Dry or wet (moisture laden) air?
  3. Temperature of air?

6. What is the altitude the fan will be operating at?

7. Is anything going through the fan that could be explosive or flammable?

8. Will the general location the fan will be operating in contain any type of explosive or flammable material or liquid?

9. If the fan will be used to convey material, answer the following:

  1. What is the material?
  2. How much does the material weigh, in pounds per cubic foot?
  3. How many pounds will you need to convey per hour?
  4. Is the material long and stringy or granular?

Most fans and blowers can be used for any of the above parameters except, if conveying material, a blower with a forward curve (squirrel cage) wheel and any fan with a propeller, is not suitable. The best centrifugal wheel type for conveying material is a radial wheel or an open radial wheel. If the material you will be conveying is long and stringy, like paper trim or fibers, only an open radial wheel should be used. The best models to use, for conveying material through the fan, are Models PB, SPB or PBS Pressure Blowers and Model RBE Radial Blade Exhauster. Models HDBI (Heavy Duty Backward Inclined Blowers) and HDAF (Heavy Duty Airfoil Blowers) are also used in many dust collector applications where the blower is on the clean side of the dust collector.

If the exhaust fan will be used to create suction, pressurization, cooling, combustion air, forced ventilation, exhaust or general ventilation, then only the first eight conditions above need to be considered. After the first eight conditions are known, the blower selection will be based on the type of blower that is best suited by performance, design and features that best meet those conditions.

Cincinnati Fan does not manufacture any consumer or residential type fans or blowers. But, we do manufacture 14 models of centrifugal blowers and 18 models of axial fans that are designed and constructed as industrial type. We manufacture centrifugal blowers and fans in the ¼ to 125 horsepower range, with airflow capacities from 50 to 51,900 CFM and static pressures from 1/8” to 78” SPWG.

APPLICATIONS:

Since Industrial Fans is such a broad term, it would be useless to try and list all the applications here.
For applications of more specific fan and blower types, please see the following:

BENEFITS:

For the same reason as stated under applications, please refer to the same fan and blower types listed under applications above.

We have over 170 experienced sales engineers across the U.S.A. and Canada ready to assist you in making the proper industrial exhaust fan selection. Call our sales office for your area. They very likely have already sold some fans and blowers for your type of application.

We are "The OEM and Industrial Air Handling Specialists" Let us prove it to you.