The new return air mixing section 1, the new return air position according to design requirements can be separately provided at the ends of each side, top, or so, such as air handling units of the sample is inconsistent with the manufacturers to provide specific open position. In return air can be fitted on the new valve, actuator with manual, electric and pneumatic three types, optionally by the user. 2, the filter section there early, in effect filter two, with a diamond-shaped bag, four peaks bag manufacturers in Zhejiang modular air conditioning units can also be equipped with an automatic winding type, filter wheels with high-quality non-woven polyester, and filter using the quick-release mechanism Hebei factory modular air conditioning units, capping display and alarm device. Energy recovery section for dual fan system for cross-points and exhaust air mixing with energy recovery. This segment has a return valve cabinets, top energy recovery device, it is a use of the exhaust of cold (hot) to the indirect cooling (heating) of new wind, new wind energy recovery through the plate, recyclable exhaust sensible heat about 60% of energy. At the same time, exhaust and fresh air is not in direct contact with the Tianjin factory modular air conditioning units, especially for indoor air-conditioning system to exclude direct harmful gas energy recovery. When the DC system for use, should be closed once the return air valve, a highly toxic gas sites should set up a separate ventilation system, should not use that section. Shandong factory modular air conditioning units, air handling units, Nankai District, manufacturers, air conditioning provided by the Texas Yunfeng Yunfeng air conditioning and ventilation equipment Limited. Texas Yunfeng HVAC Equipment Co., Ltd. (www.yataicc.com) strong, credible, in Dezhou fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving Yunfeng innovative ideas will lead into the brilliant air conditioning and you work for a better future!