POSITIVE AUTOMATIC DRAFT CONTROLAbstract of the DisclosureA furnace control means is provided for reducing heatlosses in the chimney stack to a minimum. The flow of airthrough the furnace and the flue pipe is controlled by a meansto interrupt the flow of air during the period when the burneris not in operation and the usual leakage of combustion gasesor the combination of such gases and air from the flue pipeto the furnace room, through the use of such means, isprevented by the use of an airtight radiator and flue pipe upto the means location.
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