These small, simple oven have a different design and used for different purposes. Entirely metal and heating, are made of sheet steel of different thickness. They are divided into simple and frame. The first enclosure formed by the sheet, the second under it as under his shirt, hiding the frame — the steel frame. The latter is more convenient for manufacturing. Metal furnaces come in round, square, rectangular shape.
A small heating furnace can be folded from a brick square or rectangular. They are suitable for heating, drying room, food, lumber, etc.
Furnace from a roofing steel suitable only as temporary: they will quickly be out of business. For protection of the body from burning and to improve the heat transfer it from the inner side lined — veneer brick e a quarter or a half; you can do the same glinobeton or clay. Glinobit — very thick clay, hard mash runes; clay — the same glinobit, but with the addition of small brick stones.
Lined kiln heat up more slowly, but hold heat longer. It should be recalled that earlier in the countryside produced a lot of ovens from glinobit and they served for decades.
Furnace linings may be of different thicknesses: from 10 to 120 mm. To 70 mm its better to run from picopeta or clay, again of brick.