Gas Heater Vent System Application Furnaces For Fuel Type LP Natural Gas For Appliance Type Boilers Commercial Water Heaters Gas Furnaces Pool Heaters Unit Heaters Maximum Vent Pipe Diameter 4 in Maximum Heater BTU Input for Gas Appliance 250 000 BtuH Maximum Heater BTU Input for Oil Appliance Not Applicable Inlet Diameter 4 in Outlet Diameter 4 in Compatible with Brand Tjernlund Nameplate Voltage 115V AC Current 1.26 A