Makeup air systems must operate simultaneously with which system?

Makeup air systems are designed to introduce fresh air into a building to replace the air that is being expelled, typically through an exhaust system. When an exhaust system operates, it creates negative pressure within the space, which can lead to issues such as backdrafting or inadequate airflow. To maintain proper air balance and ensure that the indoor environment remains safe and comfortable, the makeup air system must operate simultaneously with the exhaust system.

This simultaneous operation allows for the correct volume of air to be replaced, preventing the buildup of negative pressure that can disrupt the efficiency of heating, cooling, and ventilation systems and adversely affect indoor air quality. By functioning together, both systems ensure that the air being exhausted is effectively replaced, maintaining a stable and healthy environment within the building.