NATURAL SMOKE AND HEAT VENT

摘要

The invention is a natural smoke and heat vent (1) of the type comprising: a fixed frame (2) that delimits an opening (A) made in a wall (P) of a building; a flap (3) provided with a movable sash (4) defined by: an upper edge (4a); a lower edge (4b); a first side edge (4c) and a second side edge (4d); hinge means (6) defining a rotation axis (X) of the flap (3); a side wall (7) that connects each side edge (4c, 4d) of the movable sash (4) to the fixed frame (2) and whose varying surface has the maximum surface area when the flap (3) is completely open; means for opening the flap (3) and defining an upper opening (5) at the level of the upper edge (4a). Each side wall (7) consists of an extensible sheet (9; 10; 20; 30; 40; 50; 60) suited to be completely housed in a cavity (70) provided at the sides of the fixed frame (2) when the flap (3) is closed.