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This invention relates generally to inflatable restraint systems and, more particularly, in one aspect to the type of inflator known as a hybrid inflator and the treatment of gases therein and in another aspect to the treatment of gas generated by inflatable restraint system inflators. Many types of inflators have been disclosed in the art for inflating an air bag for use in an inflatable restraint system. One type involves the utilization of a quantity of stored compressed gas which is selectively released to inflate the air bag. Another type derives a gas source from a combustible gas generating material which, upon ignition, generates a quantity of gas sufficient to inflate the air bag. In a third type, the air bag inflating gas results from the combination of a stored compressed gas and the combustion products of a gas generating material. The last mentioned type is commonly referred to as an augmented gas or hybrid inflator. Hybrid inflators that have been proposed heretofore have, in general, been subject to certain disadvantages. For example, the burning of the pyrotechnic (gas generating) and initiation materials in such inflators invariably results in the production of particulate material. The use of such a particulate-containing inflator emission to inflate an air bag can in turn result in the particulate material being vented out from the air bag and into the vehicle. Typically, the particulate material is variously sized and includes a large amount of particulate within the respirable range for humans. Thus, the passage of the gas borne particulate material into the passenger compartment of the vehicle, such as via conventional air bag venting, can result in the undesired respiration of such particulate material by the driver and/or other passengers which in turn can cause consequent respiratory problems. Also, such particulate can easily become dispersed and airborne so as to appear robesmoke and thereby result in the false impression that there is a fire in or about the vehicle. It has also been proposed to screen the gaseous emission coming from the pyrotechnic portion of such hybrid inflators. For example, the above-identified U.S. Pat. No. 5,131,680 discloses the inclusion of a circular screen "128" between the body of pyrotechnic material and the orifice through which the pyrotechnically produced emission is passed to the pressurized gas-containing chamber of the hybrid inflator. Also, U.S. Pat. No. 5,016,914 discloses the inclusion of a metal disk having a plurality of suitably sized openings therein. The disk is disclosed as functioning to trap large particles such as may be present in the generated gas. Such techniques of filtering or screening the gaseous emission of the pyrotechnic section of the hybrid inflator prior to contact with the stored, pressurized gas of the inflator generally suffer such as from undesirably slowing or preventing the transfer of heat to the stored gas from the relatively hot generated gas and particulate material. In general, such a transfer of heat to the stored gas is desired in hybrid inflators in order to produce desired expansion