![]() The unit base is made from a heavy duty GSS fabricated channel. ![]() The framework is made from thermal break extruded Aluminum profile with thermal barrier. These skins are made from 0.6 mm to 0.8 mm pre-coated or plain GI sheets. The casing comprises outer skin and inner skin. Here is a typical configuration of a standard AHU in India. Sometimes, depending on the climatic conditions, an AHU may also incorporate a humidifier/dehumidifier coil. The filtered air passes through this coil and then the fan delivers the air to different parts of the building through ductwork. The coil can be a cooling coil or heating coil. The next stage in the AHU is that of a coil. Filters are periodically cleaned and changed in order to maintain the air quality and at the same time to increase the lifespan of an AHU. Whereas for specific operations such as for a testing lab or research and development facilities, multiple stages of filters including HEPA filters are deployed in the AHU to maintain the desired air quality. For example, for a typical office building, a single stage bag filter is sufficient to remove dirt, dust particles from the air. Filters can be installed in a single stage or multiple stages. The next stage in the AHU is that of filters. The dampers can be manually operated or fully automated. However, in case, the return air is highly concentrated with CO2 or CO or other gasses, then, dampers may be opened fully to allow fresh air to enter the AHU. In case, the return air is circulated fully, then, dampers may be closed fully to stop the entry of fresh air in the AHU. The dampers can be fully opened or partially opened or fully closed depending on the fresh air requirements. The grill is used at the inlet and outlet duct in order to stop foreign objects such as birds, animals, reptiles, or metal objects from entering the main section of the AHU. This optimization of AHUs results in reduction in CAPEX for the client and at the same time delivers optimized OPEX for running the AHUs.Īn AHU consists of several stages. A right HVAC design will not only optimize the numbers of AHUs but also optimize the airflow volume of each Air Handling Unit. AHUs are custom made as per the specific requirements mandated by the HVAC design. Whereas floor mounted AHUs can deliver airflow volume ranging from 1000 CFM to 100000 CFM. Ceiling mounted AHUs generally come with a lower airflow volume, typically upto 5000 CFM. Outdoor Units > AHU > Supply DuctworkĪHUs can be either ceiling mounted or floor mounted. The HVAC design may mandate a single AHU for an entire building or the design may require several smaller AHUs to serve different parts of the building.Ĭhiller Plant > AHU > Supply Ductwork Therefore, an Air Handler Unit is chosen based on the HVAC design. Whereas, a large AHU with an airflow volume of 45000 CFM may be serving the entire building. For example, a smaller AHU with an airflow volume of 3000 Cubic Feet per Minute (CFM) may be supplying conditioned air to 3-4 rooms within a given building. As the name suggests, Air Handling Units or AHUs are used for handling and subsequently delivering the conditioned air to different parts of a building.
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