Rheem GHE80SS Use & Care Manual page 20

Figure 13. Typical Vertical Direct Vent System Installation
Alternate vertical venting with exhaust vent
turned down - preferred for cold climates.
Terminals spacing for horizontal or vertical venting.
24 in. (61 cm) Min.
Exhaust Vent
Terminal
Installation
Straight Exhaust Terminal
Support Bracket
Water Heater
Floor
Terminals with 1/2 in.
(1.3 cm) Mesh
Protective Screen
Combustion Air-Inlet
Terminal
Min. 18 in. (46 cm) above Roof
Min. 12 in. (30.5 cm) above anticipated
snow level
Max. 24 in. (61 cm) above roof without
additional support)
Exhaust Vent
Elbow
"D"
"D"
20
24" (61 CM) Min
(Support required).
90° Intake Terminal
"D"
"D"
Short Piece of Pipe
Combustion Air-Inlet
-A-
-B-
d .008
-B-
d .010