9100353INSTALLINGHEATERContinuedVENTING HEATER(continued)WARNINGDo not vent heater in any of the following ways (see Figure 4).Heater must be vented to the out-doors. Never vent heater to anotherroom or inside a building.The vertical section of vent pipe mustextend at least two feet above thehighest point of any roof within tenfeet.Never extend vent pipe horizontallythrough outside wall and terminate.You must connect a vertical run ofvent pipe to the horizontal run. Thevertical run must be at least 25%longer than the horizontal run.Never extend vent pipe horizontallythrough a chimney or flue. You mustconnect a vertical run of vent pipe tothe horizontal run. The vertical runmust be at least 25% longer or fivefeet minimum than the horizontal run.Vertical run of pipe must be at leastfive feet from elbow to elbow.Figure 4 - Improper Venting Systems Continued