Selkirk 3"/4" Air Intake Tee (Direct-Temp Multi-Fuel)Selkirk 3" 4" Air Intake Tee Allows outside combustion air to be directed to the pellet stove and vents the flue gases to the outside. Can be installed horizontally or vertically when connected to a Tee with Cleanout. Available in 409 stainless steel or galvanized painted black. Direct Temp Multi Fuel System Direct Temp Multi Fuel converts any conventional biomass appliance into a Direct Vent system. This unique venting system is designed to withstand