Primary Industries for Induced Draft Fans
Induced draft fans are found across industries. However, because they are instrumental in processing air, gas, and materials under harsh conditions, you can be sure you’ll need an induced draft fan in any or all of these industries:
- Agricultural Processing
- Automotive OEM
- Building Materials
- Chemical Processing
- Food Processing
- Glass Manufacturing
- Metals & Mining
- Oil & Gas
- Paint & Surface Coatings
- Power Plants
- Printing, Packaging & Labeling
- Pulp & Paper
- Rubber & Plastics
- Semiconductor & Electronics
- Wastewater Treatment
Selection & Specification of Induced Draft Fans
As mentioned above, induced draft fans typically operate at higher efficiencies relative to forced draft fans, though it depends on the nuances of your application. They also have better process control and stability with reduced exposure to elements like wind, rain, and hail. Select and design your fans based on function, flow, and pressure. Here’s a quick overview of the top fans for each main function:
Typical Types of Induced Draft Fans
Fan Arrangements indicate how the motors mount to and drive the fan. For induced draft fans, we typically use a direct drive arrangement. Usually, Arrangement 4 or Arrangement 8, unless the blower is very large, in which case we might specify an Arrangement 7:
Arrangement 4 – Direct Drive with an overhung impeller. A low-cost arrangement, the fan wheel mounts directly on the motor shaft.
Arrangement 4V / Top Mount – Direct Drive with an overhung impeller. The wheel also mounts directly on the motor shaft, but in a vertical position.
Arrangement 7 – Direct Drive with a center-hung impeller. The motor is directly coupled to the fan shaft with a bearing on either side of the fan wheel. Involves a bearing on either side of the fan wheel and is supported by the fan housing.
Arrangement 8 – Direct Drive with an overhung impeller. The fan shaft is directly coupled to the motor shaft with a flexible coupling.
Fan Accessories & Design
The same harsh conditions (high temperatures, acidic airstreams, and other extreme exhaust gas) that make induced draft fans the right choice also make them critical components of operations, and present risks to your fan’s health. If harsh environments present higher threats to your fan’s health, then it’s probably safe to assume your maintenance and operating costs will be higher.
Frequent vibration and temperature testing, fan cleaning, bearing lubrication, and higher power consumption are some of the factors you may want to consider when selecting your induced draft fan. For example, choosing a fan with high static efficiency may significantly lower your operating costs.
Here are just some of the accessories and features you may see In induced draft fan applications:
Talk with Our Application Engineers
If you feel overwhelmed by all this information, don’t despair! We have a team of application engineers who are happy to talk with you and select the best fan for your application. You can call 715-365-3267, email [email protected], or send us your information, and one of our engineers will connect with you.
Here are related posts and case studies that might be of interest as you think about your application.