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Air Handling Unit (AHU)

Air Handling Units (AHUs) are essential components in HVAC systems used across various industries. Their primary role is to efficiently handle and condition the air that circulates within a building or facility. AHUs play a crucial role in maintaining indoor air quality, controlling temperature and humidity, and ensuring comfort for occupants while also providing energy efficiency and control.

These specifications and features can vary significantly depending on the specific AHU model, manufacturer, and industry application. AHUs are versatile and essential components in industrial HVAC systems, playing a crucial role in maintaining indoor comfort and air quality while optimizing energy efficiency and control.

Specifications of Air Handling Units

AHUs come in various sizes and configurations to meet the specific needs of different industries and applications. Key specifications to consider when selecting an AHU include :

Airflow Capacity

AHUs are available in a range of airflow capacities, typically measured in cubic feet per minute (CFM) or cubic meters per hour (CMH).

Construction Material

AHUs are constructed from materials such as galvanized steel, aluminum, or stainless steel, chosen based on the application's requirements.

Heat Recovery

Some AHUs feature heat recovery systems to capture and reuse energy from the exhaust air, increasing energy efficiency.


AHUs may include various types of filters to remove dust, allergens, and contaminants from the incoming air.

Fan Type

Different fan types, such as centrifugal or axial fans, can be used to handle different airflow and pressure requirements.

Control Systems

AHUs often come with advanced control systems, including programmable logic controllers (PLCs) and sensors for precise regulation of temperature, humidity, and air quality.

Working Principle of Air Handling Units

The basic working principle of an AHU involves the following steps:

Air Intake

The AHU draws in ambient air from outside the building or facility


The incoming air passes through filters to remove particulate matter and impurities.


The air is conditioned by heating or cooling coils, depending on the desired temperature.

Humidity Control

Humidifiers or dehumidifiers may be used to adjust the air's humidity level.

Fan Operation

Fans within the AHU circulate the conditioned air through ductwork to distribute it to various zones or spaces.


The AHU ensures adequate ventilation by mixing fresh outdoor air with recirculated indoor air.


Exhaust fans may be included to remove stale air and maintain air quality.

Benefits of Air Handling Units

Improved Indoor Air Quality

AHUs filter and condition incoming air, removing contaminants and maintaining a clean, healthy indoor environment.

Energy Efficiency

Modern AHUs are designed for energy efficiency, with features like variable speed fans, heat recovery, and demand-based control.

Temperature and Humidity Control

AHUs ensure precise control of temperature and humidity levels, enhancing occupant comfort.


AHUs can be tailored to specific industry needs, ensuring they meet the unique requirements of different applications.

Cost Savings

Efficient AHUs can lead to lower energy bills and reduced maintenance costs.


AHUs help industries meet regulatory requirements for indoor air quality and environmental standards.

Features of Air Handling Units


AHUs can be modular in design, allowing for easy expansion or customization.

Advanced Controls

Integration with building automation systems (BAS) for centralized control and monitoring.

Air Quality Monitoring

Built-in sensors for continuous monitoring of indoor air quality parameters.

Noise Reduction

Insulation and soundproofing to minimize noise generated by the unit.

Maintenance Access

Easy access panels and service points for maintenance purposes.


Safety features such as fire dampers and emergency shutdown systems.