15
Installation
Typical Horizontal Direct Vent System
Install piping through the wall as shown in Figure
10 and 12. Adequate length of pipe must protrude
beyond the exterior wall for attachment of the
termination fitting. The recommended distance be-
tween the terminal fitting and the exterior walls is
6 inches (2.5 cm). Directions for cementing joints
(such as the terminal fittings to the straight pipe)
can be found on page 11. A single 90° elbow is
supplied with the water heater for the termination
fitting on the air intake. If other fittings are required
they must be purchased separately. The supplied
90° elbow contains a protective screen to block
foreign debris or small animals from entering the
pipe. If a screen is preferred at the exhaust ter-
mination, it must have a low resistance to airflow.
Refer to the type of screen used in the supplied
elbow. A screen that significantly restricts airflow
will reduce the performance of the water heater
and could cause nuisance control lockouts. Com-
plete the installation of the remainder of the vent
and air intake system and attach to the water
heater as shown in Figure 12. Horizontal sections
of the exhaust vent shall slope upward and away
from the water heater a minimum of 1/8” per foot
(10 mm per meter). This will allow the condensate
in the vent to run back to the condensate drain on
the water heater. Horizontal sections of air intake
piping shall slope downward away from the water
heater a minimum of 1/8” per foot.
Annular spaces around vent pipe wall penetra-
tions shall be permanently sealed using ap-
proved materials to prevent entry of combustion
products into the building.
CAUTION
Terminate exhaust vent with straight
pipe 45° elbow, or 90° elbow
(Field Supplied)
Air intake terminal 90° elbow
(Factory Supplied)
Connect fitting to 4"
pipe on air intake as-
sembly
Connect pipe to 4"
fitting on conden-
sate elbow as-
sembly
Figure: 12
Venting
Supports
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