Patent ID: 6960129

Claim:
A conditioned vestibule for a cold storage doorway, comprising: a frame that supports inner and outer moveable door-forming members, wherein the frame comprises first and second side members positioned on opposite sides of the doorway opening; a heater that conditions air between the inner and outer door-forming members; a fan that varies flow of the air between the inner and outer door-forming members; air discharge means that receives the air from the fan and discharges the air across the doorway opening, wherein the air discharge means comprises a pair of blades running generally lengthwise along the first side member, wherein the blades direct air discharged from an opening positioned between the blades across the doorway opening to an inlet in the second side member, wherein the blades are positioned in a first orientation when the door-forming members are closed and automatically adjust to a second orientation when the door-forming members are open; and air return means that receives the air discharged across the doorway opening and returns the air to the fan for recirculation.