Grate for refrigerated cooler

A cooler comprising:

• a cabinet having a front wall, a back wall, first and second longitudinally spaced side walls, a insulated floor panel and a insulated top panel cooperatively defining a lower chamber for housing articles to be cooled and an upper chamber disposed superadjacent said lower chamber;
• a generally horizontally disposed diffuser plate positioned between said lower chamber and said upper chamber, said diffuser plate having a plurality of openings passing therethrough;
• at least one evaporator disposed within dais upper chamber for cooling air passing therethrough;
• at least one air circulator disposed within said upper chamber in operative association with said at least one evaporator for generating a flow of cooling air passing through said at least one evaporator;
• first and second generally vertically extending air return ducts, each having an inlet opening superadjacent said floor and an outlet opening into said upper chamber, said first air return duct lying along side first side wall and said second air return duct lying along said second side wall;
• a lower return air duct defining a bottom airflow passage lying superadjacent said floor and extending beneath the articles housed within said lower chamber, said lower air return duct having a generally horizontal, longitudinally extending base disposed in spaced relationship with and above said floor of said chamber, said bottom airflow passage in flow communication with each of said air return ducts, and
• a support grate having a relatively open framework and including a generally horizontally extending deck extending superadjacent said floor, a first edge fence integral with said deck and extending generally vertically upwardly from a first edge of said deck and thence outwardly to abut said front wall, and a second edge fence integral with said deck and extending generally vertically upwardly from a second edge of said deck and thence outwardly to abut said back wall.