Designed to stringed Military Specifications  -for the United States. Navy, this model  MAC 20-S8 air conditioner is being used in a group of mobile vans on the Pacific Missile Range and at similar sites throughout the world.
As shown in the photo at right, the unit was mounted in the rear of the van and designed to operate with the rear access doors closed –discharging the condenser   air through louvers in the doors. (Normally this unit is designed to operate with doors open.) With the doors closed, condenser air is taken in through the floor of the trailer, aft of the running gear. Fresh air for normal and emergency operation enters the van through the side louvers.
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