Heat recovery house chimney accessory - comprises shutter flap flue controlled by burner flame or flue gases

摘要

The chimney accessory comprises one or more shutters mounted in the flue (12). These are controlled by the burner flame and/or the flow of flue gases in the chimney, setting them in any position between the fully open and fully shut ones. Adjusting movement of the shutter can be effected via a time delay, and it can be movable into the shut, open and half-open positions, as it is secured to a shaft (9) working in bearings in a frame. The shutter rotation can be by a motor, magnets etc., and it can be spring-biased into open position.