Why is it critical for makeup air systems to work simultaneously with exhaust systems?

It is essential for makeup air systems to operate simultaneously with exhaust systems to prevent pressure imbalances within a building. Exhaust systems are designed to remove air, often along with heat and contaminants, from the space. If this air is not replaced by a makeup air system, it can lead to negative pressure conditions inside the building. Negative pressure can cause several issues, such as compromised indoor air quality, backdrafting of combustion appliances, and difficulty in maintaining proper ventilation.

When makeup air systems are activated simultaneously with exhaust systems, they ensure that the air being expelled from the building is balanced by an equivalent amount of fresh air being introduced. This balance helps maintain consistent pressure levels, which not only promotes safe and efficient operation of HVAC and combustion systems but also contributes to improved comfort and safety for occupants. Thus, the interaction between these systems is critical in managing building pressurization effectively.