Improved air curtain for slit door has the door dropping from the slit and with an angled edge of the curtain to ensure clean slit edges

摘要

An improved air curtain for a slit door, e.g. for access to an ultra clean sterile space, has the wall (2) over the slit angled towards the slit to guide the edge of the curtain to wash over the edges (4) of the slit and prevent accumulation of dust and small particulates. The access door (1) drops vertically, or is hinged to fold away from the slit to either side thereby ensuring that the air curtain is not impeded.