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The new material for venting high efficiency furnaces is a special white PVC plastic. The right hand pipe is blowing the water vapour away from the combustion air intake that is the 90deg. elbow pointed down next to the wall. If the vent sending water vapour away from the house was to have an elbow installed then the steam would collect inside the air intake and freeze solid on those very cold nights when you need the furnace the most and shut the furnace down.
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