the chamber of the fireplace that contains the fire.

That part of the kiln between the ash pit and the firing chamber in which the fire was set and maintained throughout the firing process.

An area of combustion in the boiler.

Combustion chamber of a gas, oil, or wood-fired kiln. Its location depends on the type fuel and the shape of the kiln and draft system.

The combustion area of a fireplace, furnace or boiler, where the fire is contained.

Literally a box containing the fire. It is surrounded by water on the top and all sides. The bottom is a grate with an ash pan below that.