Specifications include, but are not limited to: To provide the University of Arizona, Steward Observatory (UASO) with a new or used Chicago Bridge and Iron Works (CBI) Model # 12’4” x 22’6” Thermal Vacuum System Space Simulation Chamber, or equal. 5.1 Vacuum Chamber Specifications. 5.1.1 Vacuum Pressure and Dimensional Requirements. 5.1.1.1 The chamber must be able to achieve a vacuum pressure of 5 mbar in 2 ½ to 4 hours. 5.1.1.2 The chamber must be able to cool to -60 F in two hours, then rewarm and hold at 0F for 96 hours. 5.1.1.3 The chamber should be oriented horizontally and be equipped with a full width ‘vault style’ door that swings 110 degrees and is vibration isolated when closed. 5.1.1.4 The doors and chamber shell should be of 304L stainless steel, ¾” wall thickness.