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Units that are used to serve food and designed to keep hot food heated and cold food chilled to serving temperatures outside of the zone where bacteria can grow. Food service systems can be hot food bars, cold food bars, or combination hot-and-cold food bars. Food service systems can be configured as buffet equipment to let patrons serve themselves, set up in a serving line for food service staff to serve patrons, or used to display \'grab-and-go\' items like bottled drinks and packaged snacks. Food serving systems are available as freestanding units, countertop buffet warmers, or drop-in wells, which are all meant to be used with food pans. Freestanding units may be portable carts or tables. Countertop buffet warmers are placed on a countertop and plugged in for operation, and drop-in wells are installed into the countertop via an appropriately sized cutout. Hot food bars can be operated with either electric or gas; sometimes hot food serving systems use steam to keep food heated. Cold food serving systems are cooled by a refrigeration system or with ice.
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