Patent ID: 7252052

Claim:
A gas-fired heating apparatus comprising a nearly or completely closed combustion chamber ( 2 ); at least one atmospheric gas burner ( 5 ) arranged inside of said nearly or completely closed combustion chamber ( 2 ); a complete premixing gas/air supply system ( 8 ) associated with said at least one atmospheric gas burner to supply fuel gas and combustion air to said at least one atmospheric gas burner, said complete premixing gas/air supply system ( 8 ) having an entrance ( 8 a ); an oscillation-damping air supply chamber ( 11 , 11 ′, 11 ″) connected to said entrance ( 8 a ) of the premixing gas/air supply system ( 8 ); and a fuel gas feed nozzle ( 10 ) arranged within said air supply chamber ( 11 , 11 ′, 11 ″) and at said entrance ( 8 a ) to said complete premixing gas/air supply system ( 8 ), wherein said fuel gas feed nozzle ( 10 ) is in communication with an inlet for said fuel gas arranged outside of said combustion chamber; wherein said oscillation-damping air supply chamber has a duct shape, said air supply chamber embraces a wall ( 2 a ) of said combustion chamber ( 2 ) and extends partly around said wall ( 2 a ) on both sides of said entrance ( 8 a ) to said premixing gas/air supply system ( 8 ), said oscillation-damping air supply chamber ( 11 ′) has respective air intake openings ( 12 ′) on opposite ends thereof, and said respective air intake openings ( 12 ′) are arranged outside of said combustion chamber ( 2 ).