What is defined as an assembly for conducting air from an indoor space to the outdoor atmosphere?

The term that describes an assembly for conducting air from an indoor space to the outdoor atmosphere is known as an exhaust system. An exhaust system is specifically designed to remove stale air, pollutants, or unwanted heat from an indoor environment and transfer it outside, thereby improving indoor air quality and facilitating proper ventilation.

In contrast, a supply system is focused on bringing fresh air into indoor spaces. An air handler serves to circulate and condition air within a building, but it does not inherently define the action of expelling air outside. A duct system refers to the network of ducts that can distribute both supply air and exhaust air, but by itself, it does not specify the direction of airflow. Thus, the correct choice accurately identifies the function of moving air out of an indoor space.