How A Duct Booster Fan Can Improve Your HVAC Circulation

A room that doesn't receive hot or cold air as well as the others is a common phenomenon in many homes. The good news is that you may not have to retool your whole system to resolve this annoying issue. If you would like to learn more about improving your HVAC circulation, read on. This article will teach you about the wonder of duct booster fans.


The purpose of a duct booster fan is to increase the rate of air flow into rooms located farther away from your HVAC unit. Such rooms often experience problems with undercooling, under heating, or both. A booster fan is placed inside of the duct just behind the register. It is essentially a small fan that acts to push a greater volume of treated air into the problem room, thus helping it come to the desired temperature. 

Register Fans And Inline Fans

The simplest type of booster fan is known as a register fan. These fans are designed to replace the register that is located on the wall, floor or ceiling of the room. The outside of a register fan looks just the original metal grate--horizontal slats and all. The fan portion is hidden behind this, inside of the actual duct. The fan is operated using a control panel that is built into the register face. Certain models can be set to turn on automatically when a certain temperature threshold is detected.

Inline fans offer the next step up, both in terms of efficiency and the amount of noise they generate. Here a section of the ductwork that leads to the room is removed, and the inline fan installed in its place. It is connected to the furnace by means of an electric relay switch. This instructs the fan to turn on and off in conjunction with the furnace, thus ensuring that the fan runs only when absolutely necessary.

Installing A Register Fan

While a more effective long term solution, the installation process for an inline fan is also much more involved. Unless you happen to have experience performing duct modifications, not to mention electrical wiring, you'll likely need to hire an HVAC professional to perform the installation. Installing a register fan, on the other hand, is easy enough for almost anybody to accomplish.

To install a register booster fan, you will first need to remove the pre-existing register. Be sure that the fan you have selected is the appropriate size for your register--either 4x10 inches or 4x12. The fan is screwed into place, plugged into a nearby outlet, and then you should be good to go!

For more information, contact a company like Meyer's Companies Inc.