Patent ID: 6145616
Filing Date: 2000-11-14
Classification: F04B,F04D

Abstract:
An acoustic chamber for a cooling fan having a fan opening, the acoustic chamber comprising:a floor, a ceiling and first and second side walls forming a chamber having first and second ends, the first end being an open end for placement adjacent an exterior noise source;at least the first side wall comprising plural parallel insulated side baffles spaced from each other to allow flow of air between the parallel insulated side baffles, the parallel insulated side baffles extending between the floor and ceiling;the parallel insulated side baffles being elongated in a plane parallel to the roof and ceiling and having a length in the direction of elongation that is greater than the spacing between the parallel insulated side baffles;the parallel insulated side baffles being placed so that sound energy from the open end impacts with at least one of the parallel insulated side baffles before leaving the acoustic chamber;an air impermeable wall at the second end, facing the open end and extending across the second end between the first and second side walls and between the floor and ceiling; andthe side walls having sufficient permeability to permit flow of air through the side walls.