在过去的十年里，单管道VAV终端设备得到了很大的发展。它们已经从最大/最小范围有限的高压装置发展到具有可变最大/最小关闭功能的低压装置，并具有压力独立性能。这些年来，控制元件得到了改进，并确实对这些装置的能力改进负有责任。最新开发的“死区”温控器。这种类型的恒温器有几种形式，使建筑业主能够遵守最近颁布的美国能源部建筑温度限制。 该法令允许在低于78°F的温度下进行冷却，在高于65°F的温度下进行加热。当“死区”恒温器与风扇驱动的VAV终端装置一起使用时，一种全新的令人兴奋的HVAC组合成为可能。引文:研讨会，ASHRAE交易，第86卷，第2部分，科罗拉多州丹佛

Single duct VAV terminal units have developed a great deal in the last ten years. They have evolved from high pressure devices with limited maximum/minimum range to low pressure units having variable maximum/minimum down to shut off with pressure independent performance. The control elements have improved through the years and indeed are responsible for the improved capability of these units. The latest generation of control development has produced the "Dead Band" thermostat. This type of thermostat comes in several forms and enables building owners to comply with the recently promulgated United States Department of Energy Building Temperature Restrictions. This decree allows no cooling below 78°F and no heating above 65°F. When the "Dead Band" thermostat is used with Fan Powered VAV Terminal units a whole new exciting variety of HVAC combinations becomes possible.