The mixed air through the second air heater to a predetermined state point, the muffler noise from the blower, and finally into the interior. In the air through the return air duct is provided by the indoor discharge muffler noise, the back portion of the fan air conditioning units excluded from the system price, and the rest be used as a return air. A return air flow and secondary air volume by the respective return valve opening degree control. Practical engineering air handling units consist of the respective processing requirements process may be. Modular air-conditioning unit is assembled. Some bring their own cooling system, cooling system without some of their own (with cooler) air required for the process is complete, must be combined filtration, cooling, dehumidification, humidification, etc. section. Exhaust and fresh air while not in direct contact with the air conditioning unit maintenance, especially for air conditioning systems exclude DC energy indoor harmful gas recovery air conditioning units, as the DC system, a return air valve should be closed, this way you save a part of electricity also ensures operation of the unit, so the air conditioning unit model, which is a manifestation of eco-friendly unit. In practical applications, which we can easily find, air conditioning units among the advantages of running applications, environmentally friendly energy is one of the most prominent among the advantages of its operation, also attracted much praise! Offer air conditioning unit, Chen Yu-conditioned (Online) , air conditioning units are provided by Wu Cheng Chen-yu air-conditioning Limited. Wu Cheng Chen-yu air-conditioning Co. (www.wccykt.com) is an industry leader in Shandong Dezhou, fans, ventilation equipment, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Chen Yu-conditioned in leadership with the staff warmly welcome all inquiries negotiations to create Chenyu air conditioning better future.