(2) Every cooking or heating appliance must be installed in accordance with the appliance manufacturer’s recommendations, if any, with regard to clearances and with regard to materials, including insulation, installed in way of the appliance. If the space does not allow the minimum clearance, if any, recommended by the manufacturer,
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(c) the appliance must be installed so that the temperature of every surface adjacent to the appliance will not, when the appliance is operated, exceed 90°C or, if the surface is readily accessible, 60°C.