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Low-Noise 380V/3n/50Hz Power Supply Air-Cooled Frequency Single-Cooled Modular Rooftop Air Conditioning Unit, Find Details and Price about Rooftop Air Conditioning Frequency Air Conditioning from Low-Noise 380V/3n/50Hz Power Supply Air-Cooled Frequency Single-Cooled Modular Rooftop Air Conditioning Unit - Guangdong Tongfang Ruifeng Energy Saving Technology Co., Ltd.