The transfer window is an air purification equipment used in conjunction with clean workshops. It is suitable for the transfer of medium and small goods between clean rooms or between clean rooms and non-clean rooms. By using the transfer window, the number of opening and closing doors of the clean room can be reduced and the contamination of the clean area can be reduced to a minimum. Products are widely used in air purification places such as microtechnology, electronics industry, biological laboratories, pharmaceutical factories, hospitals, and food processing industries.