Air Handling Unit Construction

What is Air Handling Unit (AHU)

An Air Handling Unit (AHU) is a key component of a heating, ventilation, and air conditioning (HVAC) system. It is responsible for conditioning and circulating air throughout a building, by filtering, heating, cooling, humidifying or dehumidifying it as required.

AHUs are typically large enclosures that contain various mechanical components, such as fans, filters, heating and cooling coils, dampers, and control systems, all arranged in a specific configuration to optimize their performance. The following is a general overview of the construction of an AHU:


The frame is the structural foundation of the AHU, typically made of steel or aluminum, and designed to withstand the weight of the various components and resist the stresses and vibrations that occur during operation.


The panels form the outer shell of the AHU and are usually made of galvanized or stainless steel or aluminum. The panels are insulated with mineral wool or foam to prevent thermal loss and ensure thermal efficiency.


The fans in an AHU are responsible for moving air through the system. They are usually centrifugal or axial fans and can be driven by electric motors, V-belts or direct drive.


The filters in an AHU are designed to remove dust, dirt, and other contaminants from the incoming air. The type of filter used depends on the quality of the air required, and they may be made of fiberglass, polyester, or other materials.


The coils in an AHU are responsible for heating or cooling the air. They can be made of copper, aluminum, or other materials and are often arranged in a counterflow or crossflow configuration.


Dampers are used to control the flow of air through the AHU. They can be motorized or manually operated and are usually made of steel or aluminum.

Control systems:

The control systems in an AHU are responsible for monitoring and adjusting the various components in the system to maintain the desired temperature, humidity, and air quality levels. They can be simple or complex, depending on the requirements of the building.

Overall, the construction of an AHU is a complex process that requires careful planning and design to ensure optimal performance and efficiency. It is usually customized to meet the specific needs of the building, and the size and configuration of the components can vary depending on the space available and the desired air flow rates.

Among them, the pressure difference rise value of the air filter should be paid more attention to, and frequent maintenance of cleanliness can reduce the energy consumption and life of the unit.