Rheem GHE80SU Use & Care Manual page 17

Figure - 11- Typical Horizontal Power Vent System
When 6 inch pipe is used, start pipe
supports as close as possible to unit.
NOTE: Horizontal
venting shall be
installed with a slight
upward slope of 1/4"
per foot.
WATER
HEATER
DRAIN
PAN
* A 6 inch pipe can be used on 300,000 Btu/h models and above.
Installation
EVERY 3' MAX
SUPPORT BRACKET
FLOOR
17
.
2, 3, 4, OR 6*
INCH PIPE AND
FITTINGS
45° TERMINAL
1 IN. MAX.
WALL