A custom air handling unit (AHU) is a specialized piece of equipment used to regulate the temperature, humidity, and air quality of a given space. It is typically installed in commercial and industrial buildings, and is designed to provide a comfortable environment for occupants. AHUs are made up of several components, including a fan, filters, coils, and dampers. The fan is responsible for drawing in outside air and pushing it through the filters and coils, which remove pollutants and help to regulate the temperature. The dampers are used to control the amount of air that is released into the space, and can be adjusted to maintain the desired level of comfort. Custom AHUs are designed to meet the specific needs of the space, and can be tailored to provide the right amount of air circulation, temperature control, and air quality.