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TM 5-684/NAVFAC MO-200/AFJMAN 32-1082

If these tests indicate the presence of an explosive mixture in the structure, an injection of carbon di­oxide (CO,) into the structure may be made, before ventilating, to reduce the possibility of an explosion. Ventilation is best provided by a power-driven por­table ventilating blower. Before the structure is purged with a blower, or CO, is injected into it, personnel in connecting structures should be warned, as the gas may be blown through the ducts into connecting structures. If CO, is used, the struc­ture must be purged with fresh air before it is en­tered by personnel.

b. Toxic gases. A calorimetric indicating gel tube manufactured under specifications of the National Bureau of Standards, commonly referred to as the NBS carbon monoxide detector, is available to test for toxics. It is used by breaking the seals of the tubes and aspirating gas to it from the atmosphere to be tested. Chemicals within the tube change color

when carbon monoxide is present. By comparing the change in color with the color chart furnished, the concentration can be determined. Tests of this type can be made in less than one minute.

c. Asbestos-cement fireproofing.

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