In petrochemical plants and oil & gas production facilities, there is the potential for gas exposure accidents. H2S is one of the most dangerous gases. H2S Shelters provide a safe haven for personnel to take refuge in the event of a major H2S and CH4 release. People can stay in the shelter for up to 2 hours pending rescue. Engineers can handle the emergency in the operating room. When needed, they can put on personal respirator and stop emission outdoor.