Safety unit for the controlled closure of ventilation ducts

摘要

A unit (1) for the controlled closure of ventilation ducts (2) of the type that passes from the inside of an enclosed space (3) to the outside and comprises appropriate protective grilles (4, 5) on the openings. The internal space (3) in turn comprises a flow control cock (7) on the fuel supply pipe (7a). The unit (1) comprises a kit (8) for flow control and closure of the duct (2) controlled by the cock (7). The kit (8) is in the configuration for closing the duct (2) when the cock (7) is in the condition for closing the pipe (7a) and therefore the flow of fuel is blocked, and in the configuration for opening the duct (2) when the cock (7) is in the condition for opening the pipe (7a) and the flow of fuel is allowed.