Sub-Zero Inspects Refrigerators Sub-Zero Will Inspect Refrigerators That Can Tip Over In cooperation with the U.S. Consumer Product Safety Commission (CPSC), Sub-Zero Freezer Company Inc. of Madison, Wis., is voluntarily offering to inspect, at no cost, its model 550 and 501 built-in refrigerators/freezers installed between June 1989 and December 1992. Sub-Zero has