Kindle without fuming

Ovens that are operated irregularly, after kindling, often smoke, for example in a country house. I propose to mount a horizontally located U-shaped heater with a power of 1-1.5 kW in a horizontal chimney, which is usually located in the lower part of the shield. Before lighting the furnace, you need to turn on the heater for about 30 minutes to warm the chimneys. Verified by two years of operation! From soot the heater is cleaned during the cleaning of chimneys. For convenience, it can be mounted on a door or plug intended for cleaning.