Patent ID: 7669490

Claim:
A filter testing apparatus adapted for use in a clean room provided with filters for purifying air supplied to the room, a ceiling surface of the room acting as exit surfaces of the filters, the apparatus comprising: a moving frame oriented along the exit surfaces so as to be movable in a direction along the exit surfaces orthogonal to a longitudinal direction of the moving frame, and spanned between two opposing side walls in the room at a position near the exit surfaces; and a filter test device for measuring velocity of air discharged from the exit surfaces is mounted on the moving frame to be movable along the longitudinal direction of the moving frame through a supporting device; wherein the supporting device supports the filter test device with the filter test device positioned to one lateral side of the moving frame and projected at substantially the same height as the moving frame from the moving frame as viewed in the longitudinal direction of the moving frame, and wherein the filter test device can change a supported state thereof between a retracted supported state in which the filter test device is proximate to the moving frame at substantially the same height as the moving frame in the movement direction of the moving frame, and an extended supported state in which the filter test device is set at a distance away from the moving frame at substantially the same height as the moving frame in the movement direction of the moving frame.