Abstract: A suit for the protection of a wearer's body and head from heat and gas comprises an inner suit adapted to cover the wearer's body and head and having a tubular flow channel therethrough for the passage of a cooling liquid such as silicone. An outermost suit overlies the innermost suit and it has a body covering and a head covering portion. The head covering portion includes a face mask. A heat exchanger is mounted so as to connect into the outermost suit and includes a coolant chamber for containing a vaporizable coolant therein. The vaporizable coolant such as carbon dioxide is maintained under pressure and the cooling liquid is circulated into heat exchange relationship therewith so as to cool down the wearer's body. In addition the device includes a respirator for circulating respiratory air to the face of the wearer which advantageously includes a passage adjacent the heat exchanger so that the incoming air may also be cooled if desired.

Abstract: An oxygen respirator, comprises a portable container having a cartridge chamber with a cylindrical oxygen-supplying chemical cartridge centrally located in the chamber and with a replaceable CO.sub.2 -absorbing cartridge concentrically surrounding the chemical cartridge. The cartridge chamber is closed by a baseplate which includes a mouthpiece connection defining a mouthpiece passage for respirator air for the user which connects downwardly into the chamber through an associated check valve for flow downwardly through the annular CO.sub.2 -absorbing cartridge and upwardly through the oxygen-supplying chemical cartridge which, after initial ignition, supplies oxygen to the respiratory air which is circulated back to the mouthpiece passage either directly or through a breathing bag which is mounted in the respiratory air breathing passages.