Gas-air mixture system for gas heating apparatus

摘要

The system has a blower-supported combustion air and combustion gas feed, and a gas-air pre-mixture chamber to which is connected a combustion chamber separated by an opening. The cross-section of the opening (8) is adjustable by the extent of the volume flow of the combustion air/gas feed, whereby with a large volume flow the opening cross-section is large, and with a small volume flow the opening cross-section is small. The opening is formed by a flap (11), which is arranged pivotably movably at the end of the pre-mix chamber (3). The setback force of the flap is formed by its own weight or by an additional setback spring. The flap in its rest position has an opening residual cross-section.