John Wood Envirosense Power Direct Vent (May 2010 or later) - Manuel (Page 30)

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VERTICAL VENT TERMINAL INSTALLATION
WHEN TERMINATING THROUGH A ROOF, THE FOLLOWING
SPECIFICATIONS PERTAINING TO TERMINAL LOCATION
MUST BE FOLLOWED.
1. Proper support must be provided for all pipe protruding through
the roof.
2. The vertical roof terminations should be sealed with a plumbing
roof boot or equivalent flashing.
3. The air intake termination and the exhaust vent termination
must penetrate the same side of roof.
4. The center line of the air intake termination and the center line
of the exhaust vent termination must be no closer than 24”
(61cm). See Figure 17 and Figure 18.
FLAT ROOF INSTALLATION
On flat roof installations the air intake and the exhaust vent
terminations must be a minimum of 24 inches (60 cm) above any
parapet, vertical wall or structure within 10 feet (3 m) horizontally.
See Figure 19.
Figure: 17
Figure: 18
Figure: 19