
The M4 file destroyer incendiary is intended primarily to be used to destroy classified material in three or four drawer filing cabinets provided with combination locks. It is designed to permit maximum destruction of classified matter with minimum damage to the premises where the filing cabinets are kept.
The file destroyer incendiary consists of 44 oxidizer boxes, 4 igniter boxes, and 4 racks. The oxidizer boxes furnish oxygen to permit papers to be burned in a closed file drawer. The igniter boxes set fire to the papers and oxidizer boxes. The racks compress the papers and oxidizer boxes while the papers are burning. Forty four pounds of paper can be destroyed with this incendiary.
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TM 3-300, Ground Chemical Munitions (1956)