What is the difference between makeup air unit and handling unit?

Makeup air unit and air handling unit (AHU) are both essential components of a heating, ventilation, and air conditioning (HVAC) system. While they serve similar functions, there are key differences between the two.

Makeup air unit (MAU)

A makeup air unit is designed to replace air that has been exhausted from a building. This air can be lost through exhaust fans, kitchen hoods, or other ventilation systems. Without makeup air, a negative pressure would be created inside the building, which can lead to several problems, including:

* Backdrafting of combustion appliances, such as furnaces and water heaters

* Reduced ventilation effectiveness

* Increased infiltration of outdoor air through cracks and crevices

* Higher energy costs

A makeup air unit works by drawing in outside air and conditioning it (heating or cooling) to match the temperature of the air inside the building. The conditioned air is then supplied to the building through a duct system, where it is distributed to various rooms and spaces.

Air handling unit (AHU)

An air handling unit is a more comprehensive HVAC component designed to control the temperature, humidity, and air quality of a building. In addition to heating and cooling the air, an AHU can also:

* Filter the air to remove dust, pollen, and other particles

* Dehumidify or humidify the air

* Add or remove fresh air

* Control the airflow volume

AHUs are typically used in larger buildings, such as offices, schools, and hospitals, where there is a need for more precise control over the indoor environment.

Key differences between makeup air units and air handling units

The following table summarizes the key differences between makeup air units and air handling units:

| Feature | Makeup air unit | Air handling unit |

|---|---|---|

| Primary function | Replace exhaust air | Control temperature, humidity, and air quality |

| Typical applications | Smaller buildings, such as homes and small businesses | Larger buildings, such as offices, schools, and hospitals |

| Features | Heating/cooling, supply fan | Heating/cooling, dehumidification/humidification, air filtration, fresh air intake, airflow control |

Ultimately, the choice of whether to use a makeup air unit or an air handling unit depends on the specific needs of the building. For small buildings with a limited need for environmental control, a makeup air unit may be sufficient. For larger buildings with more complex environmental requirements, an air handling unit is typically a better choice.

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