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In-line Duct Fans

Providing a comfortable temperature can often be a challenge in a forced air heating/cooling system with long ducts, a single zone, or rooms above unheated areas like crawl spaces and garages.An in-line duct fan that boosts the air flow through the ductwork can by pumping more heat or cooling to specific rooms..

In-line duct fans can be installed in a register or within a duct:

  • A register booster fan is installed in place of the regular register and begins operating when it detects warm air from the furnace or cool air from the air conditioner. Relatively inexpensive, they can be used in either a wall or floor register. For use in a ceiling, look for one designed for the ceiling to avoid any problems with the fan falling out and causing harm.
  • In-line duct fans, installed inside the ductwork and out-of-sight, are connected to the blower of your heating/cooling system and can boost the airflow to more than one room. Because ductwork comes in various sizes, you will need to match the size of the fan to the size of the duct. If your ductwork is flexible, look for booster fans that are designed for them. Although more expensive than the register boosters, they can be operated by a separate thermostat or a manual switch, which lets you turn off the fan when you are away from the room. Two-speed duct fans (high or low fan speed operation) are available and can provide an additional level of control.

Because in-line duct fans are made for boosting moderate temperature and humidity airflow, they should not be used in place of dryer vent boosters, bathroom fans, or other types of exhaust fans.

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