![]() Like a single-acting control, it opens inwardly to maintain a uniform draft. Gas-Fired Appliances\nGas-fired furnaces and boilers generally require a double-acting draft control.To detect flue gas spillage on dual fuel installation, a Field Thermal Safety Switch is recommended.\n\n ![]() The double- acting feature is important for gas-firing appliances because it allows spillage of combustion products in case of blocked flues or down-drafts. 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.
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