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The customized air tight door china is to prevent the direct convection between the isolated space and the external air and form a certain negative pressure in the isolated space, that is, the pressure in the isolated space is smaller than the external pressure. Therefore, the external pressure acts on the door by using the air pressure to tightly fasten the door and ensure the good sealing and impermeability of the isolated space, So as to reduce the pollution of the isolated space to the outside world. Commonly used in medical air tight door china is one of the indispensable hospital special doors in many medical institutions. Needless to say, we also know its role. Because the operating room is operated, it can not affect the doctors or patients in the operation. Customized air tight door china is needed to play its role. Next, we will introduce the six constituent elements, process characteristics and customization characteristics of the lower air tight door china.