American Water Heater PowerVent Use & Care Manual page 15

NOTICE: All pipe, fittings, solvent cement, primers and procedures must conform to American
National Standards Institute and American Society for Testing and Materials (ANSI/ASTM) standards.
Vent Pipe
From
Water Heater
Pipe Coupling
Min. 12" Above Roof
Min. 12" Above
Anticipated Snow
Level.
Max. 24" Above Roof
(Without Additional
Support)
2' x 2' Sheet
Metal Shieldon
Brick or Masonry
Walls
Vent Terminal
with / " Mesh
1
2
Protective Screen
Inside
Outside of
Building Wall
Insert 1/2" Mesh Protective
Screen Inside Terminal Elbow
Short Piece of Vent Pipe
Vent Pipe
Through Roof
Elbow
Vent Terminal
Vertical Vent Installation
Once the vent terminal location has been
determined, make a hole through the roof
and interior ceiling to accommodate the
vent pipe.
Complete the vent pipe installation to the
water heater's vent connector fitting on the
blower outlet.
Support vertical or horizontal lengths as
previously mentioned.
Install adequate flashing where the vent
pipe passes through the roof.
Minimum Vent Restrictor
Mesh
Vent Pipe
Horizontal Vent Installation
Once the vent terminal location has been determined, make a
hole through the exterior wall to accommodate the vent pipe.
Vent pipe must exit exterior wall horizontally only.
Insert a small length of vent pipe through the wall and connect
the coupling as shown to the left.
Place the 1/2" mesh metal screen inside the terminal fitting
and connect it as shown to the vent pipe on the exterior of the
building.
Complete the rest of the vent pipe installation to the water
heater's vent connector fitting on the blower outlet.
If necessary support horizontal run as previously mentioned.
Vertical Vent Termination Location
The location of the vent terminal depends on the following
minimum clearances and considerations (see illustration):
Minimum twelve (12) inches above roof.
Minimum twelve (12) inches above anticipated snow level.
Maximum twenty-four (24) inches above roof level without
additional support for vent.
Four (4) feet from any gable, dormer or other roof structure
with building interior access (i.e., vent, window, etc.).
Ten (10) feet from any forced air inlet to the building. Any
fresh or make-up air inlet such as a dryer or furnace area is
considered to be a forced air inlet.
Determine the vent terminal height and cut
vent pipe accordingly. Refer to the above
section for proper vent terminal height.
Connect vent elbow onto vertical pipe
through roof.
Connect short piece of vent pipe
(approximately 3" long) to elbow, then
insert 1/2" mesh metal screen into terminal
elbow and join it to the short piece of vent
pipe.
Vent Restrictor
Install the vent restrictor at the minimum
vent length only. The vent restrictor
Vent Terminal
should NOT be installed for any vent
lengths greater than those on page 13.
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