Patent ID: 7341448

Claim:
A gas-fired heating apparatus comprising a combustion chamber ( 2 ); at least one gas burner ( 5 ) arranged within said combustion chamber ( 2 ); a combustion gas/air supply system ( 18 ) having an intake device ( 16 ) for combustion gas and primary combustion air to be mixed with the combustion gas, wherein said intake device ( 16 ) is arranged outside of the combustion chamber on the heating apparatus; and an oscillation-damping air supply chamber ( 11 ) connected to the combustion gas/air supply system ( 18 ), wherein said oscillation-damping air supply chamber ( 11 ) is provided with at least one main air inlet ( 12 ) through which a part of the primary combustion air is admitted to the air supply chamber ( 11 ), and said oscillation-damping air supply chamber ( 11 ) is a Helmholtz resonator and is connected to the intake device ( 16 ); wherein the oscillation-damping air supply chamber ( 11 ) has an exterior wall ( 11 ′) and a pattern ( 13 , 14 ) of perforations in the exterior wall, said perforations acting as additional air inlets through which an additional part of the primary combustion air is admitted to the air supply chamber.