The transfer window is an auxiliary device for the clean room. It is mainly used for the transfer of small items between the clean area and the clean area, between the clean area and the non-clean area, to reduce the number of times the clean room is opened, and to pollute the clean room. Reduce to a minimum. The transfer window is made of stainless steel and is smooth and smooth. The double doors are interlocked to each other to effectively prevent cross-contamination. They are equipped with electronic or mechanical interlocking devices and equipped with ultraviolet germicidal lamps.