Please mail to info@guchen.com, HVAC Systems for Coach and transit applications. Guchen LFD Series Coach/ Bus air conditioning system including heating system, this rooftop mounted bus A/C adopts multilevel air purification system and energy-efficient cooling system, is designed for 10-12 meter city bus or 11-13 meter coach, using original Bock FK 40 655K compressor, which is powered by vehicle engine. for more detail information please: www.guchen.com/bus-air-conditioner/bffd-06.html www.guchen.com/bus-air-conditioner/lfd-series-coach-airconditioner.html