in line duct fan heater

in line duct fan heater

Installing an In Line Duct Fan Heater: A Guide

When winter arrives, most people want to invest in heating systems for the home that are effective and efficient. An in-line duct fan heater, or an exhaust fan heater, is a great option for providing extra heating in an area or providing direct ventilation or filtration. In-line fan heaters are installed into the ducts of an existing forced air system, allowing air to be heated and filtered, or even cooled in the summer, as needed. Although some professional installation may be necessary, in-line duct fan heaters are relatively easy to install if you have the right tools and knowledge.

In this article, we’ll discuss the benefits of installing an in-line duct fan heater, explore the materials and tools you’ll need to complete the job, and provide step-by-step instructions for properly completing the installation. We’ll also provide troubleshooting advice should you encounter any problems during the installation process.

Benefits of an In Line Duct Fan Heater

There are many benefits associated with in-line duct fan heaters. Not only do they provide an effective and efficient solution for heating an area, but they can also help to reduce energy consumption and save money on utility bills. Additionally, these fans are relatively easy to maintain, as they do not require regular cleaning. In-line fans are also typically more effective than traditional room fans, as they are able to more effectively circulate air throughout an area. Finally, they can also be used in combination with other heating systems, allowing them to provide supplemental heat and cooling in the summer.

Materials and Tools Needed

Before you begin the process of installing an in-line duct fan heater, you’ll need to gather the right materials and tools. The items you’ll need will vary depending on the type of installation you’re undertaking, but in general, you should have the following items on hand: an in-line duct fan heater, venting materials and tools, screws or other mounting materials, a screwdriver or power drill, wire cutters, duct insulation and electrical wiring.

Step-by-Step Installation Process

Once you have all the materials and tools you need for the job, it’s time to begin the in-line duct fan heater installation process. The following step-by-step instructions will walk you through the process:

1. Determine the location for your fan: Before you begin installation, you’ll need to determine where the fan will be placed in relation to the duct system. The fan should be located within 18 inches of the furnace and should be able to access the return (cold) air duct.

2. Install your venting materials: Begin by installing the venting material, such as a duct wall cap or sleeve, in the area that you determined in step 1. Make sure that all connections are secure and properly sealed.

3. Mount the fan: Once the venting material is in place, you can mount the fan to the wall or duct. Make sure to secure it with screws, and be sure to leave extra space around the fan so that it can draw in air.

4. Connect the fan to the duct: Before connecting the fan, turn off power to the furnace. Then, attach the fan to the duct using appropriate connectors and screws. Make sure to properly seal any gaps or seams.

5. Insulate the fan: After the fan is securely attached to the duct, it’s important to insulate the fan to ensure that it is not affected by heat loss. Use duct insulation to wrap the fan, ensuring proper coverage.

6. Connect the fan to electrical supply: Use the appropriate wiring and connectors to connect the fan to the electrical supply. Make sure to follow all safety regulations and be sure that the wiring is properly insulated.

7. Test the fan: With all of the wiring and connections in place, test the fan to ensure it is working properly. Make sure to also check the temperature settings to make sure that the fan is providing the heating you’re expecting.

Troubleshooting Tips

The installation of an in-line duct fan heater is relatively straightforward, but there are a few common issues you may encounter during the process. The following are some general troubleshooting tips that may be helpful should you experience any problems:

- Make sure all connections are properly sealed: If your fan is not heating air properly, it’s possible that there is an issue with the connections between the fan and the duct. Be sure to go back over each connection and make sure they are securely sealed.

- Check the temperature settings: If the fan is not providing the correct amount of heat, the temperature settings may need to be adjusted. Make sure to check the settings to make sure they are correct.

- Test the fan: If the fan is not running or not running properly, be sure to test it to make sure it is functioning correctly.


In-line duct fan heaters are a great way to provide supplemental heating in an area. Although some professional installation may be necessary, in-line fan heaters can generally be installed easily with the right materials and tools. As long as you follow the instructions outlined above, you should be able to easily install an in-line fan heater.

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