We suggest using a double-acting control on units where fuels are frequently changed. Dual Fuel Appliances\nBurners capable of burning either gaseous fuels or oil should be equipped with a barometric draft control.A barometric draft control will help eliminate this undesirable stack action and permit the unit to be pressurized.\n\n Forced Draft Burner\nForced Draft installed with a stack height in excess of 30' will probably develop excessive natural draft, reducing the amount of pressure within the furnace or boiler.While a draft hood (diverter) is often used on gas units fired with an atmospheric burner, a double-acting barometric draft control should be used for furnaces or boilers fired with power burners.\n\n A single acting draft control for oil maintains that negative pressure.\nA power burner designed to burn natural or LP gas operates in the same manner. Power Burners\nA power burner is designed so that a fan delivers negative air pressure to the combustion chamber.Use a single acting control for oil, and a double-acting control for gas-fired equipment with a draft induced system\n\n
Use a single-acting control for oil and gas-fired equipment with a power vented system.
These fluctuations can be negated by the use of a barometric draft control located between the draft inducer or power venter and the furnace, boiler, or water heater it services. Draft Inducers/Power Venters\nWith these devices, draft is increased or created, causing fluctuations in air flow through the combustion chamber.
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