A door frame with adjustable width, which consists of two frames and an upper cross frame. The two frames and the upper cross frame are composed of two door fan hinge fixates and a cover plate respectively. In the two door fan hinge fixates, a regulating plate and a "Z" type fixer are arranged in order from the inside to the outside; a screw hole is provided with a screw hole through a screw and a door fan at one end of the adjustment plate. The end of a hinge is connected to one end.
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