Red Seal Sheet Metal Worker Practice Exam

What is the purpose of an air handler in an HVAC system?

1. To remove moisture from the air

2. To filter pollutants from the air

3. To circulate air throughout the building

4. To heat the water supply

The correct answer is: To circulate air throughout the building

The purpose of an air handler in an HVAC (Heating, Ventilation, and Air Conditioning) system is primarily to circulate air throughout the building. Air handlers are units that typically house a fan, heating and/or cooling elements, and a filtration system, allowing them to effectively move air throughout a building's ductwork. Their main role is to ensure consistent airflow, which is essential for maintaining temperature and indoor air quality. By drawing in air from the environment, conditioning it (through heating or cooling), and redistributing it, air handlers create the necessary circulation that enables the entire HVAC system to function efficiently. While air handlers may also play a role in filtering pollutants and humidity control, their primary function is to facilitate the movement of air. This circulation is crucial for balancing temperature and ensuring that conditioned air reaches all areas of the building, thus contributing significantly to overall comfort and energy efficiency.