Constant Air Volume (CAV) systems are a พื้นฐาน to meet HVAC needs. Being a simple system in nature, it has become one of the most popular systems overtime. The basic concept of CAV systems is to use a constant supply air volume through the distribution system while heating or cooling the air to meet the spaces needs. There are typically 3 different types of CAV systems; single duct, reheat, and mixed air.