Tjernlund I Inline Draft Inducer Fan for Vertical Vent Systems for All Fuels Solves venting problems due to undersized chimneys, long vent runs, down drafts and negative pressures Uses with Boilers, Furnaces, Water Heaters, Ovens, and Factory Processes Can be used with multiple appliances (additional controls required) Vents/Chimneys utilizing In-Line Draft Inducers must be vertically terminated above the roof line Should be paired with UC1, PS1505 and possibly other controls for safe operation