The Temperature Compensated Stored Gas (TCSG) inflator provides output gas which is completely clean and cool, with no particulate or objectionable chemical components. The has no combustion-based gas generation and hence needs no filtration. As a result it is environmentally attractive, more easily recyclable, requires little or no pyrotechnic material and can be classified as a non-pyrotechnic device. To improve on earlier deficiencies of stored gas inflators, the variation of output with temperature is narrowed by means of internal mechanical components. For the first time, significant energy is added to the gas by convection rather than by chemical means. Pulse-shaping is also provided by mechanical means.