Room temperature control for some DC-type system, fresh air not only make the environment meets health standards, but also bear all the indoor load. Because indoor load varies fresh air unit maintenance, then the use of the supply air temperature control is not necessarily the way to meet the requirements of indoor (probably too hot or too cold). It is necessary to control the temperature of the place of use. It can be seen, when the temperature sensor must be located in a typical area controlled room. Since the DC system usually has exhaust system, temperature sensor located in the exhaust pipe and consider certain amendments also a viable option. Obviously Horizontal fresh air unit, the control part of variable air volume control (VAV later on control see below), this control method currently used is not a lot of new wind generating units, one important reason is the CO2 concentration controller products are not universal ( Only a few manufacturers), while investment in this type of control is large, its overall economic efficiency requires specific analysis. The new air unit maintenance | Rui Xincheng air conditioning (certified) | new air handling units provided by Rui Xincheng Air Conditioning Equipment Co., Texas. Texas Rui Xincheng Air Conditioning Equipment Co., Ltd. (www.dzrxckt.com) is a leader in Dezhou, fans, ventilation equipment, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Rui Xincheng conditioning in leadership with the staff warmly welcome all inquiries negotiations to create a better future Rui Xincheng air conditioning.