Air ventilation box e.g. air extraction box, for ventilation installation in e.g. hospital, has conduit connected to zone of fan and outlet orifice, where section of conduit connected to fan is smaller than section connected to orifice

摘要

The box (1) has an inlet orifice (4) for inletting an air flow, and an outlet orifice (5) for outletting the air flow. A motorized fan (6) i.e. turbine fan, is arranged between the inlet orifice and the outlet orifice for injecting the air flow present in the inlet orifice towards the outlet orifice. A conduit (7) is connected to a delivery zone (8) of the fan and to the outlet orifice, where a section of the conduit connected to the fan is smaller than a section of the conduit connected to the outlet orifice. An independent claim is also included for a ventilation installation comprising an air ventilation box.