Patent ID: 7243677

Claim:
An air exchange assembly comprising: a lower supply duct having a first lower supply duct end and a second lower supply duct end, said first lower supply duct end connected to an external cooling unit; a bottom cap attached to said second lower supply duct end at a first end and attached to one end of a body at a second end; an upper supply elbow mounted on a rotatable plate at another end of the body and communicatively connected to said bottom cap through a rotatable assembly extending through the body to the end of the body adjacent the second end of the bottom cap creating a first passage for air flow for a device to be cooled from said second lower supply duct end to said upper supply elbow through said bottom cap, wherein the rotatable plate is attached to the rotatable assembly; an upper supply duct having a first upper supply duct end and a second upper supply duct end, said first upper supply duct end connected to said upper supply elbow and said second upper supply duct end connected to the device to be cooled; an upper return duct having a first upper return duct end and a second upper return duct end, said first upper return duct end connected to the device; an upper return plenum connected to said rotatable plate and connected to said second upper return duct end; a second passage connected to said upper return plenum; a lower return plenum connected to said second passage creating a passage from said upper return plenum to said lower return plenum; and a lower return duct having a first lower return duct end and a second lower return duct end, said first lower return duct end connected to said lower return plenum and said second lower return duct end connected to the external cooling unit.