Bonnet front door in fully opened position
burning 60,000 BTU, noncontaminating, hot air heaters operating on 120 AC,
60 cycle, single-phase power. The heaters are located in the van bonnet on
either side of the air conditioner (figure 2).
Control facilities permit
circulation of both heated and unheated fresh air drawn from outside the
van, mixed with air drawn from inside the van. The proportion of outside
air and inside air may be varied.
Hot air ducts in the van front wall
conduct heated air from the heaters into the van interior through four heat
registers (figure 2) in the van front panel when the registers are open.
When the registers are closed, the heated air is conducted through
corrugated ducts beneath the aluminum floor tread plate which functions as a
radiator, this function extends to the hinged floor sections.
radiating surface of the floor is available when the van is either expanded
or retracted. Variations in