Rheem GHE80SU Use & Care Manual page 18

Figure - 12- Typical Horizontal Direct Vent System
When 6 inch pipe is used,
start pipe supports as close
as possible to unit.
WATER
HEATER
DRAIN PAN
* A 6 inch pipe can be used on 300,000 Btu/h models and above.
Through The Wall Venting With Low Ground Clearance:
When venting cannot exit through the wall at a height greater than or equal to 12" (30.5 cm) (and above expected
snow level) from the ground, then the installation must be modified as shown below (see Figure 12a).
1" (2.54 CM)
Figure 12a. Vent Terminal (Low Ground Clearance)
Installation
SUPPORT BRACKET
90° INTAKE
TERMINAL
Min. of 12" (31 cm)
above grade.
"D"
Min. of 12" (31 cm)
above anticipated snow
GROUND
LEVEL
Max of 24" (61 cm) with-
out additional support
.
EVERY 3' MAX
FLOOR
"D"
level.
18
2, 3, 4, OR 6* INCH PIPE
AND FITTINGS
45° TERMINAL
1 IN. MAX.
WALL
1" (2.54 CM)
EXHAUST
TERMINAL
"D"
GROUND
LEVEL