24
NOTICE:
It is recommend to have a vent length as short as
possible. Input rate at high altitude naturally is derated.
In addition to that, input rate of the water heater
decreases more if there is restriction (pressure drop) in
the venting system. Refer to input rate reduction table
due to vent length on page 24. Actual input rate reduction
may be different at each installation.
NOTICE:
Make sure that the seam of the inner vent pipe in a
horizontal run is towards the top of the installation
as shown above.
Venting Through Closed Spaces
If the coaxial vent piping passes through a closed
space, a minimum clearance of 0 in. (0 cm) for
vertical piping and for horizontal piping should
be maintained between the coaxial vent pipe and
combustibles and non combustibles. Be sure
to follow local codes and vent manufacturer’s
installation instructions.
For maintenance and inspection purposes, the
following access panels may be required.
Two (2) inspection access panels large enough to
allow access for venting inspection. One access
panel may be close to where the coaxial vent pipe
enters the ceiling. The other access panel may be
near the vent termination.
It is recommend to have a vent length as short as
possible. Input rate of the water heater decreases
if there ir restriction (pressure drop) in the venting
system.
The following table shows approximate input rate
reduction. Actual input rate reduction may be
different at each installation.
This table will only apply to the indoor models.
INSTALLATION INSTRUCTIONS
Venting for Direct-Vent Water Heater
Vent Pipe Wall Plate
Inspection
Access Panel
(Optional)
Inspection
Access Panel
(Optional)
CeilingFire
Stop
90˚
Elbow
1/4" Per Foot Downward Slope
(recommended)
Venting
Setting Min Vent Length Max Vent Length
A-1 0% 10%
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