![]() Make it simple by calling the 888 toll-free number on this page. DIY requires decent handyman skills – or simply call an HVAC contractor to do the work. Most in-the-duct booster fans are for round ducts, but a few manufacturers produce models that can be installed in either round or rectangular ductwork. However, if you need a larger booster fan to push air to several rooms, it is an indication that your blower motor is undersized for its job. A few are large enough for the larger “trunk” duct that supplies the whole house. Also called an inline booster fan, most produce enough airflow for one duct that feeds air to a particular room. Some of them can be pre-set at different fan speeds, while others will automatically change fan speeds depending on conditions and settings.ĭuct booster fans of this type must be installed directly inside the HVAC ductwork itself. In-the-Register booster fans are available with motors of various sizes that can move anywhere from 45 CFM (cubic feet per minute) to almost 300 CFM of air. The unit must then be plugged into a standard 110V outlet by means of an included power cord. Some units can be secured in a wall or ceiling register with screws, but others require a special wall or ceiling kit which must be purchased separately. These units can be installed in a floor register by simply removing the original register and setting the booster fan in the now-vacant hole. 4” X 10”, 4” X 12”, 6” X 10” and 6” X 12” are four of the more common sizes, though others can also be found. They are available in several different sizes to correspond to the typical size of a floor or wall register. The easiest to install type of duct booster fan is a rectangular unit that simply replaces the register through which either heated or air conditioned air comes into the room. ![]() Which type you need is determined by factors such as current airflow, ease of installation The obvious and intended result is that more treated air will be pushed into the room to make it more comfortable throughout the year. Better fans have programmable controls that allow you to determine when they come on to increase the airflow coming through the duct when your furnace or A/C is running. Some are even plugged into a standard outlet. Cheap duct booster fans run all the time. These fans can be used in main ductwork trunks, but more often, they are installed in smaller ducts serving a single room. A duct booster fan is a small fan that is installed inside an air duct of a forced air system – forced air meaning that a blower fan is employed to pull air into the air handler or furnace and push it through the ductwork into each room.
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