Abstract: A venting device comprises an air channel and a rotary venting rod, wherein: the air channel comprises a first end facing an outer surface of the rotary venting rod and a second end away from the rotary venting rod; the outer surface of the rotary venting rod is provided with a recessed venting slot in fluid communication with ambient air, about which the rotary venting rod may be rotated about a rotation axis extending longitudinally thereof to provide a vented state and a sealed state. In the vented state, at least a portion of the venting slot of the rotary venting rod is in fluid communication with the air channel and thereby brings the air channel into fluid communication with ambient air via the venting slot. In the sealed state, the venting slot of the rotary venting rod is not in fluid communication with the air channel and the first end of the air channel is sealed by the outer surface of the rotating vent rod. The venting device of the present invention is easy to manufacture and assemble.