Patent ID: 9165548
Filing Date: 2015-10-20
Classification: G10K

Abstract:
1. A ventilation system arranged for transporting air from an inlet in a first space to an outlet in a second space, wherein a duct system interconnects the inlet and outlet, the ventilation system comprising: a ventilation fan arranged to generate a flow of air, and being arranged inside the duct system between the inlet and outlet, wherein the ventilation fan generates acoustic noise upon operation, and a loudspeaker including a diaphragm, wherein the loudspeaker is arranged in relation to the duct system such that a first side of the diaphragm is in contact with the air on a first side of the ventilation fan, and a second side of the diaphragm is in contact with the air on a second side of the ventilation fan, wherein the loudspeaker diaphragm is arranged to move substantially in anti-phase with at least a part of the acoustic noise generated by the ventilation fan so as to substantially cancel acoustic noise originating from the ventilation fan, wherein the first space and the second space are physically separated by a barrier, such that the first and second sides of the diaphragm act as respective acoustic monopoles in the first and second spaces.