ntaining a furnace for drying grain, hops, etc or for making malt (kiln) In lumber drying, a kiln is a room or building where temperature, moisture, and the amount of air circulating are controlled to dry wood (kiln) an oven-like compartment built to contain the heat around the item to be calcined, cooked, baked, burned, or fired A pot kiln (or field kiln) is usually built with an open top to fa