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burner kits designer range renovator range grate range accessories Furnace design, based on the principle Kronstedta, was later refined by Swedish engineer Wiman, who developed the so-called principle of countercurrent. After that, the stoves any significant changes have occurred. In furnaces with a counter, as a rule, use the following ideas: fire channel connected to the furnace, separated from the shell of the furnace by means of "dry" joint or smoke channel, so the hottest part of the furnace has freedom of movement and does not depend on the rest of the furnace design; flue gases leave the chimney at the base of the furnace, so that freedom of movement provided by the furnace shell; reaching down inside the furnace flue gases are cooled all the time, and the air rising up the outside of the furnace is heated, so that there is almost a constant temperature difference between flue gas and air in a room for the entire height of the furnace and thereby allow uniform and efficient circulation of warm air in the room . As the improvement of designs of furnaces operating on the principle of countercurrent in the late 1800's and early 1900's razvilags rich culture and mnogostosronnyaya vertical kilns and tile kilns, many of which are admired today. 13. During the past decades, thermal insulation between the structures of houses has improved several times. While simultaneously reducing fuel consumption in the flats today are not made in the design of burning wood hearths nothing new, except the heater type furnace heater for steam rooms in the bath and the various foci of prefabrication. Before the war and in postwar years, inventive activity was primarily aimed at bringing together different foci in the complexes at giving a special form of the furnace, to develop systems kolosni kovyh gratings on vozduhosnabzhe of to ensure proper combustion, to sweep the flue gas on the principle backflow, and t . etc.