An air handler is a device used to condition and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system. It is usually a large metal box containing a blower, heating or cooling elements, filter racks or chambers, sound attenuators, and dampers. Air handlers usually connect to a ductwork ventilation system that distributes the conditioned air through the building and returns it to the air handler. The components of an air handler are designed to provide efficient and reliable operation of the HVAC system. The blower is the main component of the air handler and is responsible for circulating air throughout the system. The heating or cooling elements are responsible for providing the desired temperature to the air. The filter racks or chambers are used to filter the air and remove any particles or contaminants. The sound attenuators are used to reduce the noise generated by the air handler. Finally, the dampers are used to control the flow of air and regulate the temperature in the system. All of these components work together to provide efficient and reliable operation of the HVAC system.