fire box

Noun

 * 1) The hearth of a metal-forging shop; the forge of a smithy.
 * 2) An enclosed hearth with hatch for refueling that is attached to or built into a boiler that supplies steam for mechanical power.
 * The brakeman had to help the fireman shovel coal into the firebox as the engineer coaxed his locomotive up grade.
 * 1) The internal hearth of a furnace, stove, or heater.
 * 2) The hearth of an outdoor grill.
 * When the bottom of the grill firebox burned through, everybody ran over and stomped embers too keep the picnic shelter from catching fire.