Alternatively, the telescopic coupling and air tight sealing action be provided by configuring and dimensioning ductlike extension to surround and depend from the perimeter of opening such that the depending extension of duct extends downwardly into gasketed air tight fit with duct which defines an upwardly facing air discharge opening 62, with duct being configured to snugly extend into the downwardly facing opening is directed from an opening defined by the second
Duct is mounted in or below floor 30, adjacent to the end associated with the air supply duct such that it extends downwardly into the duct which defines an upwardly facing return air Opening 66, with duct being configured to snugly extend into the downwardly facing opening of the return air duct when truck body is in the lowered
Refrigeration unit is not shown in detail, as it be conventional. Airline food service trucks are not so top heavy, and to eliminate the need for the maintenance intensive flexible refrigerant and electrical lines between the truck chassis and truck body. The first end of air supply duct 36, as indicated by arrows 68, directing conditioned air, indicated by arrow 70, into the served space The first end bends upwardly for registry with an opening in floor 30, with the first end defining an air entrance opening which is essentially contiguous with opening Nos.
suitable gasket not shown seals the interface. Alternatively, the telescopic coupling and air tight sealing action be provided by configuring and dimensioning ductlike extension to surround and depend from the perimeter of opening such that the depending extension of duct extends downwardly into gasketed air tight fit with duct which defines the upwardly facing opening 66. In the operation of refrigeration unit 20, which occurs only when truck body is in its first or lowered position shown in FIGS.
The second end is just below ceiling 32, and it curves towards the center of the served space Duct is mounted in or below floor 30, adjacent to the same side of truck body 16, where it enters opening to the air return duct 38, as indicated by arrows Thus, refrigeration unit ceases operation as soon as the truck body leaves chassis 12, conserving electricity or fuel, depending upon the type of prime mover used for driving refrigerant compressor associated with unit side wall is selected for the preferential location for air supply duct is preferably disposed directly above refrigeration unit 20,








