| 摘要 |
A ventilator mountable as a preassembled unit over a wall opening in a compartment such as, for example, the passenger compartment in a motor vehicle, truck cab, water craft, air craft, mobile home, truck camper, or the like, to regulate the passage or flow of air exchanged through the wall opening between the interior confines of the compartment and the ambient exterior atmosphere. The ventilator unit includes a frame member mountable around the bordering surface of the wall opening and provided with an open central section through which passage of air is regulated in selectively variable manner by a cover member which is shiftable between a closed and various selective open intake and/or exhaust positions by intercooperative means providing selectively shiftable pivot axes for opposite sides or sections of the cover member and cooperating therewith in such manner as to accommodate relatively independent raising and/or lowering of each of such opposite sides or sections of the cover member as well as relatively concurrent raising and/or lowering thereof between open and closed positions.
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