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Internal Blowers vs. External Blowers

Technician removing a blower motor from air handler

Blowers are an important part of many different systems, including HVAC, furnaces, and boilers. In most cases, these systems rely on either internal or external blowers to move air throughout the equipment. So what’s the difference between internal blowers and external blowers? And how do you know which one is right for your application?

In this article, we’ll take a closer look at internal and external blowers, compare their key features, and help you decide which type is right for your needs.

What is a Blower?

Before we delve deeper into the different types of blowers, let’s explain what they are and what they do. Blowers, sometimes referred to as centrifugal fans, are devices that move gasses from one area to another through the use of a spinning impeller. The impeller forces the gas perpendicular to the direction of rotation and then out through an exhaust port, resulting in a continuous airflow.

There are a number of different applications for blowers, but some of the most common include motors for ventilation and air conditioning, wastewater treatment, and industrial process systems.

Difference Between Internal and External Blowers

Blowers can come in different configurations. One of the biggest distinctions is between internal and external systems. So, what exactly is the difference between these two types of blowers?

Internal Blowers

Internal blowers are installed within the confines of the system they serve. In other words, all the components – including the impeller, motor, and housing – are located within a singular unit. Internal blowers are generally smaller and more compact than their external counterparts, which makes them a popular choice in applications where space is limited.

Need some more context? Here are some everyday items that utilize internal blowers:

  • Hair dryers
  • Vacuum cleaners
  • Computer cooling systems
  • Internal venting/ductless range hoods

External Blowers

External blowers are blower units mounted outside of the main system. In most cases, the blower is located in a separate room or area from the rest of the equipment. External blowers are typically larger and more powerful than internal units, making them a better choice for larger applications.

You can typically find external blowers in industrial settings, but there are a few common examples that you might be familiar with:

  • Boilers
  • Furnaces
  • HVAC systems
  • External venting range hoods

Should I Choose an Internal or External Blower?

Now that we’ve gone over the basics of internal and external blowers, it’s time to answer the question: which type is right for your application? The answer, unfortunately, isn’t always so simple. In most cases, the decision comes down to a number of different factors including space constraints, budget, and the specific requirements of your project.

Let’s take a look at each of these factors in a little more detail.

Space Constraints

As we mentioned earlier, one of the biggest differences between internal and external blowers is size. Internal units are typically smaller and more compact, which means they’re a good choice for applications where space is limited. External blowers, on the other hand, are larger and require more room for installation.

If space is a major concern for your project, an internal blower might be the way to go. However, it’s worth noting that external units can often reside in separate rooms or areas, which can help to save space. It really comes down to your ability to connect the blower to the rest of your system.


Another factor to consider is budget. In most cases, internal blowers are less expensive than external units. The lower cost is largely due to the fact that internal blowers are generally smaller and require fewer materials. There is a trade-off to this, however. With a smaller blower motor comes reduced power and airflow. If you need a powerful blower for your application, you might have to opt for an external unit.

Project Requirements

Finally, it’s important to consider the specific requirements of your project when deciding between an internal and external blower. If you need a powerful unit that can handle a large volume of air, an external blower will be your best bet. On the other hand, if you have a smaller space and don’t need as much power, an internal blower is the way to go.

When You’re Ready to Choose, Telco is Here

At the end of the day, there’s no right or wrong answer when it comes to choosing between an internal and external blower. It’s all about finding the unit that best meets the specific needs of your project.

If you’re still not sure which type of blower is right for you, we recommend contacting one of our experts today. They’ll be able to assess your specific situation and make recommendations based on their experience and expertise.

If you’re in the market, be sure to check out our selection of blowers. We carry a wide variety of blowers that are perfect for all sorts of applications.