1. Fans: Fans are responsible for moving air through the AHU and into the building's ductwork. They come in various configurations, including centrifugal fans and axial fans, and can be equipped with variable speed drives (VSDs) for energy efficiency and airflow control.
2. Filters: Air filters remove dust, pollen, allergens, and other particulate matter from the incoming air, improving indoor air quality and protecting downstream components from contamination. Filters are classified based on their efficiency rating, ranging from basic panel filters to high-efficiency particulate air (HEPA) filters.
3. Heating and Cooling Coils: Heating and cooling coils, also known as coils or heat exchangers, regulate the temperature of the air passing through the AHU. Heating coils use hot water or steam, while cooling coils use chilled water or refrigerants to heat or cool the air, respectively.
4. Humidifiers and Dehumidifiers: Humidifiers add moisture to the air to prevent dryness, while dehumidifiers remove excess moisture to maintain optimal humidity levels. These components are essential for comfort control and preventing issues such as mold growth and condensation.
5. Dampers: Dampers are adjustable valves or louvers located within the AHU's ductwork, regulating the flow of air to different zones or spaces. They can be manually operated or motorized and are used for temperature zoning and energy conservation.