Cass furnace, also known as cassette furnace, is a kind of unfixed cooking kitchenware with butane gas as the main gas and directly heated by fire. Cassette ovens are mainly divided into single-tube ovens, double-tube ovens, miniature ovens and ultra-thin ovens, and single-use and dual-purpose ovens, which are mostly used for family outdoor leisure and hotel supplies.

Barrel oven, also known as portable butane gas stove, the domestic code is BDZ. As the name implies, it is a kind of leisure kitchenware that can be easily carried outdoors and used in hotels without any external connection.

Butane is the main combustion gas in Cass furnace, and its chemical formula is C4H 10. When the box furnace works, butane gas enters the regulator from the butane cylinder, and enters the furnace head after being adjusted by the regulator (adjusted by the knob by the user), and at the same time, some air is mixed in (this air is called primary air). These mixed gases are ejected from the fire hole of the distributor and ignited by the ignition device to form a flame (the air required for combustion is called secondary air).

Butane gas tank is dangerous, so it should be operated correctly and away from heat source. The "Precautions" on butane cylinders indicate that portable butane cylinders are highly flammable. There are also strict regulations on the use of this kind of gas cylinder, such as checking whether the interface leaks before ignition, and it is strictly forbidden to tilt or invert the tank.