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SECTION IV: INSTALLATION (cont .)
VENT & COMBUSTION AIR INTAKE (cont.)
Install piping through the wall as shown in Figure 6. Adequate length of pipe must protrude
beyond the exterior wall for attachment of the termination fitting. The recommended
distance between the terminal fitting and the exterior wall is 1 in. (2.5 cm). Directions for
cementing joints (such as the terminal fittings to the straight pipe) can be found on page 24.
Two 45° elbows are provided with the water heater for termination fittings. If other fittings
are required (i.e. 90° elbows) they must be purchased separately. Install a screen inside the air
intake termination fitting to prevent items from entering the system. Complete the instal-
lation of the remainder of the vent and air intake system and attach to the water heater as
shown in Figure 7. It is recommended that horizontal sections of piping slope downward
away from the water heater a minimum of 1/8 inch per foot (10 mm per meter) to prevent
condensate from flowing back towards the water heater.
Annular spaces around vent pipe wall penetrations shall be permanently sealed using
approved materials to prevent entry of combustion products into the building.
4" MIN
Vertical Length
Before Elbow
Exhaust
Adapter
Page 18
Inside of
Building
HOT
Vent Pipe
From
Water
Heater
Figure 6: Horizontal Venting, 1-pipe termination
Figure 6: Horizontal Venting, 1-pipe termination
Vent (To Outside)
Air Intake
(From Inside)
3" Pipe
Fitting w/ protective
screen
3" Pipe
3" pipe systems
Figure 7: Horizontal Power Vent Connections to Water Heater
Figure 7 : Horizontal Power Vent Connections to Water Heater (3" and 4" vent pipe systems)
CAUTION
B
Outside of
Building
COLD
Vent Terminal
Wall
B
Ground Level
Wall Section View
4" MIN
Vertical Length
Before Elbow
4" Pipe
4" x 3"
Reducing Coupling
3" Pipe
Exhaust
Adapter
12" (30 cm)
or greater
Vent (To Outside)
Air Intake
(From Inside)
Fitting w/ protective
screen
3" Pipe
4" pipe systems
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