A fan powered humidifier is connected to which location?

A fan powered humidifier is connected to which location?

• A. The outdoor air intake
• B. The return duct
• C. The supply plenum
• D. The furnace exhaust

Answer: (C)

A fan-powered humidifier is placed in the path of the heated air that goes out to the house, so the humidity added by the unit mixes with the supply air and is distributed through the ducts. It’s typically installed on the supply plenum (or the supply duct downstream from the furnace) where the furnace blower pushes air. The unit uses its own small fan to move air across a water-saturated pad, adding moisture to the air before it travels to rooms. Placing it on the outdoor air intake would waste energy and humidity would be lost; locating it in the return duct or on the furnace exhaust wouldn’t effectively humidify the conditioned space. So the supply plenum location is the correct choice.

A fan-powered humidifier is placed in the path of the heated air that goes out to the house, so the humidity added by the unit mixes with the supply air and is distributed through the ducts. It’s typically installed on the supply plenum (or the supply duct downstream from the furnace) where the furnace blower pushes air. The unit uses its own small fan to move air across a water-saturated pad, adding moisture to the air before it travels to rooms. Placing it on the outdoor air intake would waste energy and humidity would be lost; locating it in the return duct or on the furnace exhaust wouldn’t effectively humidify the conditioned space. So the supply plenum location is the correct choice.