Common vent device for positive vent pressure and draft hood equipped gas appliances
AssigneeGas Research Institute
InventorsDouglas W. DeWerth, James R. Deppisch, Sherwood G. Talbert, Ronald A. Cudnik
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Abstract
A vent device is provided for common venting of exhaust gases discharged from separate apparatus at different vent pressures. The vent device provides a passageway and exhaust gas inlets for combining the exhaust gases and conveying them to a single vent stack. The higher vent pressure exhaust gases are discharged within the passageway using a venturi or jet pump effect to provide a zone of reduced pressure in the passageway for inducing the flow of the lower vent pressure exhaust gases into the device.
Claims24
A vent device for common venting a first apparatus having an exhaust pipe for discharge of exhaust gases at a first vent pressure and a second apparatus having an exhaust pipe for discharge of exhaust gases at a second vent pressure which is lower than said first vent pressure comprising housing means including a passageway having a cross-sectional area for flow of exhaust gases admitted into said housing means to a common vent stack, first inlet means adapted to be connected in fluid tight communication with said first exhaust pipe for admitting exhaust gases from said first apparatus to said housing means and second inlet means adapted to be connected in fluid tight communication with said second exhaust pipe for admitting exhaust gases from said second apparatus into said housing means, said first inlet means including a first outlet opening having a cross-sectional area substantially less than that of said passageway for discharging exhaust gases from said first apparatus at substantially said first vent pressure into said housing means, said second inlet means including a second outlet opening for discharging exhaust gases from said second apparatus at substantially said second vent pressure into said housing means, said first inlet means and housing means cooperating upon discharge of exhaust gases through said first outlet opening to provide a zone of reduced pressure adjacent said second outlet opening within said housing means to induce exhaust gas flow into said housing means from said second apparatus.
A vent device for common venting a furnace having a positive vent pressure and a water heater having a non-positive vent pressure and a draft hood comprising housing means providing a fluid tight passageway for conveying exhaust gases from said furnace and water heater to a vent stack, said passageway having a cross-sectional area sufficient to enable venting of said water heater by natural-draft, first and second exhaust gas inlet means for admitting exhaust gases respectively from said furnace and water heater into said passageway, said first inlet means including a first outlet opening for discharging exhaust gases from said furnace into said passageway, said first outlet opening having a cross-sectional area substantially smaller than that of said passageway, said second inlet means including a second outlet opening for discharging exhaust gases from said water heater into said passageway, said first inlet means and housing means cooperating upon discharge of said furnace exhaust gases at a positive pressure into said passageway to aspirate gas flow into the passageway through said second outlet opening and draft hood.
Dependencies are inferred from the claim text.