SUTRAK AC 136 G4 Roof-mounted AC system – AC 136 G4 Roof-mounted AC system – AC 136 G4 The AC 136 G4 product family facilitates adaptable heating, ventilation and air-conditioning solutions for ideal passenger comfort in city buses, tour buses and coaches. The systems are versatile, very powerful and are available with a cooling capacity from 27 kW to 39 kW. Thanks to their very compact size and the extremely low weight, all models are simple to mount on any bus roof. Furthermore, the AC 136 G4