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 HOW TO WORK AHU Air handling units! Air handling units, which usually have the acronym of AHU, are found in medium to large commercial and industrial buildings. They are usually located in the basement, on the roof, or on the floors of the building. And many large buildings will likely have a mixture of all of these. AHU will serve a specified area or zone within a building such as the  side or office areas from floors one to 10, or perhaps a single purpose such as just the building's toilets, therefore it's very common to find multiple AHUs around a building. Some buildings, particularly old high-rise buildings, will have just one large AHU which is usually located on the roof. These will supply the entire building. They might not have a return duct. Some older designs rely on the air just simply leaking out of the building. But this design is not so common any more in new buildings becauseit's very inefficient. Now it's most common to have multiple smaller AHU supply