The SHC is military unique in that it is required to circulate heated air without external electrical power, operate on logistical fuels, interface with military tents and shelters, and operate down to -608 F. There are no commercial items that can satisfy these requirements. The SHC Type I with accessories is intended to heat personnel and equipment housed in the Modular Command Post System (MCPS) and similarly sized shelters. It provides approximately 35 KBTU of circulated heated air without the use of external electrical power. The SHC Type II with accessories is intended to heat personnel and equipment housed in the MCPS, TEMPER, GP tents and MGPTS shelters. It provides approximately 60 KBTU of circulated heated air without the use of external electrical power.