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The temperature will reach -30°C in less than four hours; however, let the chamber cool for 8 hours minimum to allow for total heat removal from the cabinet. Again, this is a manual defrost system. If ice build up is present . inch or more on the fixed shelves, defrosting is recommended. Large ice build up will reduce cooling efficiency. If this system is equipped with a temperature display or alarm system it is not uncommon to observe a rise in temperature on the display following a door openin