What is the primary function of a makeup air unit in a building?

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The primary function of a makeup air unit is to introduce fresh air into a building to compensate for the air that has been removed by exhaust systems. This is critical for maintaining proper indoor air balance and preventing negative pressure within the building, which can lead to issues such as backdrafting of combustion appliances or the infiltration of unconditioned air from outside.

By supplying fresh air, makeup air units help ensure that there is sufficient oxygen for occupants and that the indoor environment remains comfortable and healthy. They play an essential role in ventilation strategies, particularly in commercial and industrial settings where significant amounts of air may be exhausted for processes, cooking, or other activities.

While humidity control, air filtration, and temperature maintenance are important aspects of overall indoor environmental quality, they are not the primary role of makeup air units. Instead, a makeup air unit is specifically focused on replenishing the air that is lost, thus supporting ventilation systems and enhancing air quality.

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