The difference between the room air and heated (air) causes products of combustion (2) to flow (draft) through the unit and rise through the breeching and chimney Room temperature air (3) enters through the draft control (4) in the precise amount needed to overcome the excess drafts caused by temperature variations
Read MoreTwo types of burner are in use Low and High Low burner These operate at low usually between 25 and 10 mbar The burner is a simple venturi device with introduced in the throat area and combustion air being drawn in from around the outside Output is limited to approximately 1 MW
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