(57) A housing (2) defines a ventilation opening (l) controlled by a closing device with
two flaps (5, 6) which are alike and are pivotally movable in opposite directions
about external hinge axes (l8) (see Fig. 2) by means of pivot drives (7) and which,
in their closed position, engage with their edges over a gutter (l9) crossing the
ventilation opening (l) centrally as well as over the walls (9, l0; ll, l2) of the
housing (2) carrying them, at their upper edge so as to completely cover the ventilation
opening (l) in the housing (2) and protect it from the entry of the weather. A transverse
girder (8) is secured to the longitudinal walls (9, l0) and engages under the gutter
(l9) and supports the pivot drives (7) for the flaps (5, 6). The longitudinal walls
(9, l0) of the housing (2) comprise supporting and locking rails (20, 2l) (see also
Fig. 3) supporting axially adjustable bearing blocks (24, 25) for the flaps (5, 6).
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