Ventilator and draught excluder grid support - fit between sloping flange and vertical flange of bottom support member

摘要

A ventilator (3) which carries sealing stips (33) around its surface, is inserted in a groove (1) in a bottom support member (2), together with a draught excluding grid (14). The support member has a vertical rear flange (7) and a shorter sloping flange (21), the two items (3, 14) being located between them. The bottom of the grid is of constant section approximately all the way down, and has a convex region (24) which is forced against the inside of the sloping inside face (25) of the short flange (21). It also has a toe (20) which is inserted inside a recess underneath this sloping face.