Feature: 1: Key products newly launched in 2012 to meet the high rising demands of the market . 2:Streamline design, Fiber Reinforced Plastic casing, feathering in high strength , corrosion resistance, and shock absorption. 3:High quality aluminum alloy base, more durable. 4:Inner screw designed tube & fin heat exchanger, with copper tube of 7mm in diameter. 5:Universal for city bus, passenger transport and touring coach, adjustable for any bus roof, economical and practical.