Sliding door or window - has perforated plate on fixed frame bearing against sliding one to provide ventilation

摘要

The sliding door or window comprises fixed and sliding frames with mating vertical profiled members locking together. The member on the sliding frame (11) has an open chamber (5) with two sides (6, 6') working in a first position against two (2) on the member (1) of the fixed frame to form a draught-proof joint. In a second position, one at least of them works against a perforated plate (10) on the fixed frame member, which extends for roughly the depth of the open chamber. Thus in the second position a ventilating air passage is provided.