BF series fan is designed to meet the requirements of different operating conditions for the air exhaust equipment, which can regulate air flow according to seasonal variations and operating conditions to save energy consumption. Featured by smooth running, low noise, small size, light wight, & convenient maintenance, it can supply air to pipelines of different directions. Fan is widely used for ventilation in air conditioning system in buildings, factories etc. Upon request, the fan can regulate air flow & pressure through AC POWER SOURCE. It can be remote controlled by electronic control box. BF series fan uses external rotor motor, dual-inlet structure, all- metal frame & removable acoustic insulation panels, which make it flexible for installation.