Draft regulators, chimney draft controllers
Air draft regulators are divided into two categories. The first category includes regulators that control the airflow by appropriately adjusting the boiler flap depending on the set temperature. Such regulators are used in furnaces not equipped with a blower or controller. This is the simplest and at the same time the cheapest way to automate the furnace and facilitate the combustion process. There are also electronic regulators that operate similarly to mechanical ones but have a display and are much more precise than standard meters; however, they require a power source. Another method of regulating the air supply is the draft regulator commonly called a flap. It is a collar equipped with a flap, mounted between the blower and the boiler collar. The flap's task is to close when the blower is not working, thereby cutting off the air supply when it is unnecessary.
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