Rheem RTGH-C95XLP Use And Care Manual page 42

INSTALLATION INSTRUCTIONS
Horizontal Vent Installation (cont.)
Fasteners will vary depending on the wall type.
NOTICE:
• The exhaust vent terminal must extend a minimum of 12
inches (30.5 cm) more than the air intake terminal from
the exterior wall.
• To prevent possibility of condensate freeze-up, do not
install vent kits one above the other.
Once the vent terminal location has been determined,
make holes through the exterior wall to accommodate
the vent pipes. Vent pipes must exit exterior wall
horizontally only.
The standard horizontal air intake termination is a
2-inch or 3-inch pipe which terminates at the exterior
wall and uses a coupling to prevent the pipe from being
pushed back into the structure. The standard horizontal
exhaust outlet termination is a 2-inch or 3-inch
pipe which terminates 12 inches from the air intake
termination. Insert a small length of vent pipe through
the wall and connect the coupling. Connect vent cap or
terminal to the vent pipe on the exterior of the building.
1. Observe minimum clearances. Vent terminals must
be a minimum of 5.5 inches (14 cm) and a maximum
of 24 inches (61 cm) apart horizontally.
2. Cut two 2 1/2" (6.4 cm) diameter holes [for a 2" (5.1
cm) diameter pipe] or 3 1/2" (8.9 cm) diameter holes
[for a 3" (7.6 cm) diameter pipe] for the exhaust vent
and air intake openings.
42
For particle board or
composite sheathing, use
4 hollow wall anchors. The
anchors should be at least
1/8 in. (0.3 cm) in diameter
and the appropriate length for
the sheathing thickness.
For plywood or solid wood
sheathing or members, use 4
#10 x 1 1/4-in. wood screws.
For masonry walls, use
suitable masonry anchors
long enough to pass through
the wall.
1
Apply silicone sealant or silicone/latex caulk to seal
the vent pipe to the vent coupling to permit field
disassembly for annual inspection and cleaning.
Completely seal where it passes through the wall plate
and where it is attached to the structure.
2
Attach the female end of the next vent pipe section
to the male end of the 2-in./3-in. (5.1-cm/7.6-cm) vent
pipe. See "Cementing Joints" on page 40.
3
Complete the rest of the vent pipe installation to the
water heater's flue outlet and air intake.