A.O. Smith VB/VW- 1000 - Manual (Page 18)

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NOTES: If the exhaust vent terminal is
within 10’ (3.0m) of a wall or parapet, it
must extend a minimum of 2’ (610mm)
above the wall or parapet.
Joints are not joined to show vent pipe
orientation.
FIGURE 11. VERTICAL TERMINATION.
FIGURE 11A. HORIzONTAL THROUGH THE WALL TERMINATION (TWT).
NOTES: Joints are not joined to
show vent pipe orientation.