The figure shows a diagram of a heating system in a cinema. According to this scheme, the outside air is forced by a fan into the filter and humidifier, and then to the heater, from which it comes out already warmed into the room.

The air outflow takes place automatically through a large roof fan located in the ceiling. However, if more air circulation is needed, there is one more mechanical suction fan in reserve, which through three holes: two in the ceiling and one in the floor, removes the air from the room to the outside. The same installation in summer can be used for ventilation, and even cooling the air taken in from the outside with the ventilator and forced into the room through a filter sprinkled with cold water.

However, recently stove fitters in Poland have started to build central air heating, with a ceramic heater with greater efficiency (for example. to keep churches warm), heating rooms located at a distance 20-30 m from the heater.

Circulating chamotte oven with a heating surface 36,3 m²: a) vertical section, b) section B-B, c) section A-A, d) section C-C.

The figure shows circulation furnaces, which are also some kind of local heaters for air heating.

Each ceiling and floor heating does not have the disadvantages previously mentioned, creates good hygienic conditions and can be used not only as central heating of large rooms, but also small apartments. It consists in a system of pipes or electric cables laid in the ceiling and connecting them to the heating device.

Fire heating scheme–air ceiling and floor.

Air, after warming up, circulates in the channels and transfers heat through the ceiling to the room. Therefore, that the warm air is not directly connected with the air in the heated room, this method of heating is much more hygienic than the method previously described, where the heated air carries more or less dust with it, if not protected by air filters.

Instead of air, water flowing in pipes concreted in the ceiling or walls can be used as a heating medium, or the electric current that heats the radiators in the ceilings.