Abstract: A gas generator for inflating an inflatable article such as a safety bag or raft, has a reaction chamber (1) surrounded by a ring-shaped filter chamber (2). First gas exit openings (10 to 15) permit generated gas to flow from the reaction chamber into the filter chamber. Second gas exit openings (22) lead from the filter chamber into the inflatable article. A temperature responsive flow control is provided to make sure that the inflation efficiency or the inflation pressure inside the inflated article is substantially constant and substantially independent of the temperature of the gas generator at which the ignition of a gas generating fuel begins.