Food freezer with internal exhaust

A food freezer (10;

• 110), comprising:
• a first housing (14;
• 114) having a first chamber (16;
• 116) arranged internally within for providing a freezing gas (20) to a food product (18;
• 118) within the first chamber (16;
• 116);
• a second housing (28;
• 128) having a second chamber (30;
• 130) arranged internally within and being in fluid communication with the first chamber (16;
• 116) for exhausting the freezing gas (20) from the first chamber (16;
• 116);
• an adjustable opening (38) comprising a baffle (60) disposed as a common wall (36;
• 136a, 136b) between the first chamber (16;
• 116) and the second chamber (30;
• 130) for interrupting and controlling a flow of the freezing gas (20) moving from the first chamber (16;
• 116) directly to the second chamber (30;
• 130), the baffle (60) constructed and arranged to provide a flow path for the freezing gas flow (20;
• 144) from the first chamber (16;
• 116) to a region of the second chamber (30;
• 130) and to prevent air being pulled directly from the second chamber (30;
• 130) into the first chamber (16;
• 116);
• wherein exhaust from said second chamber (30;
• 130) creates a pressure differential as exhaust gas pressure curtains (31;
• 131) disposed in the second chamber to prevent the air from the second chamber (30;
• 130) being pulled into the first chamber (16;
• 116), and to prevent atmosphere from an area external to the first housing (14;
• 114) and the second housing (28;
• 128) from entering said first and second housings (14, 28;
• 114, 128).