| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of the conventional duct fan, whose movable-side body of a casing is structured to open/close in an approximately 180 degrees of the casing and is provided on the outer peripheral surface of the fixed-side casing body while a base-end side of the movable-side casing body being pivotally fixed to a free-end side of a fixed-side casing body, in which a part of seal packing for enclosing an opening part opened in the upper half of an annular frame body of the casing closes while laterally shifted in a circumferential direction immediately before closing the movable-side casing body structured to open/close the semicircular shape (immediately before contacting the other free-end side of the fixed-side casing body). ! SOLUTION: An air blower includes: a casing constituted of a fixed-side casing body and a movable-side casing body which comes into contact with or separates from the fixed-side casing body, and whose both side faces are opened; a fan provided inside the |
