Which of the following is NOT a typical component of a forced air air handling unit?

• A. Chillers
• B. Duct work
• C. Heating-cooling coils
• D. Humidifiers

Answer: (A)

Forced-air air handling units are built to treat and condition the air that will be circulated through the space. Inside the unit you’ll commonly find the fan, filters, dampers, and the heating and cooling coils, and sometimes a humidifier to control moisture. The cooling that lowers the air temperature usually comes from a separate chiller plant that provides chilled water (or refrigerant) to the AHU’s cooling coil, rather than a chiller being housed inside the AHU itself. Duct work is the path the conditioned air travels after leaving the AHU, and humidifiers can be integrated with the AHU. So, the chiller isn’t a typical component of the AHU itself, making it the best choice.