Make up air units are interlocked with which of the following components?

Make-up air units are typically interlocked with exhaust fans and fire detection systems to maintain balanced air pressure and to ensure safety within a building. By interlocking these units, when an exhaust fan operates and removes air from the building, the make-up air unit can simultaneously introduce new air from the outside to replace the exhausted air. This balance helps prevent negative pressure, which can lead to issues such as backdrafting of combustion appliances or the inability to effectively ventilate spaces.

Furthermore, interlocking with fire detection systems enhances safety by ensuring that adequate ventilation is provided during an emergency scenario, allowing for the proper discharge of smoke and hazardous gases. The relationship between make-up air units and these components is crucial for maintaining air quality, comfort, and safety in various environments, particularly in commercial settings where exhaust loads can significantly impact indoor air management.