The intake air and vent pipes must penetrate the same side of the roof as shown in Figure 21 on page 25.
The intake air and vent terminations must be oriented facing downward and in the same direction as shown in Figure 21 on page 25.
The intake air and vent terminations must have a minimum separation of 24” (61 cm) measured on center line as shown in Figure 21 on page 25. In colder climates this separation should be increased to at least 48 inches (122 cm).
The bottom edge of the intake air and vent terminations must be a minimum of 12 inches (30 cm), 18 inches (45 cm) in Canada, above the average or expected snow level as shown in Figure 19 and Figure 21 on page 25.
6.When the intake air and/or vent piping from multiple water heaters will terminate in the same location the vent terminations can be grouped together in close proximity 0 inches/touching. Intake air terminations can also be grouped together in close proximity 0 inches/touching.
The distance between the closest vent and intake air terminations must be a minimum of 24 inches (61 cm) as shown in Figure 21. In colder climates this separation should be increased to at least 48 inches (122 cm).
7.Cut a 5 inch (13 cm) diameter hole for 4 inch pipe or 7 inch (18 cm) diameter hole for 6 inch pipe where the pipe(s) will pass through the roof.
Note: Beware of concealed wiring and piping when cutting through the roof.
8.Suspend the pipe(s) through center of hole using field supplied metal strapping or equivalent support materials as shown in Figure 19.
2” (5 cm) |
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SUPPLIED |
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90° ELBOW |
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10.Install the factory supplied intake air and/or vent termination(s) using field supplied pipe and one field supplied 90° elbow as shown in Figure 19. The short section of pipe that connects between the field supplied 90° elbow and the factory supplied termination must not be excessive in length. The exposed portion of this pipe shall be no more than 2 inches (5 cm), see Figure 19.
IF LESS THAN
10 FEET (3 m)
24 INCHES (60 cm)
MINIMUM HEIGHT ABOVE
INTAKE AIR AND/OR VENT TERMINATION(S) MUST BE A MINIMUM OF 24 INCES (60 cm)
ABOVE ANY PARAPET, VERTICAL WALL OR STRUCTURE WITHIN 10 FEET (3 m) HORIZONTALLY.
VERTICAL TERMINATION(S) FLAT ROOF CLEARANCE
INTAKE AIR AND/OR VENT (EXHAUST)
Figure 20
11.Return to Power Vent Installation on page 25 or Direct Vent Installation on page 25 to complete the installation of the intake air and/or vent piping between the termination(s) and the water heater.
24 INCHES (61 cm) MINIMUM
48 INCHES (122 cm) IN COLDER CLIMATES
FIELD SUPPLIED PLUMBING
ROOF BOOT OR FLASHING
MAINTAIN 12” (30 cm) 18” (45 cm) FOR CANADA MINIMUM CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL.
FIELD
SUPPLIED 90° ELBOW
VENT (EXHAUST) 
TERMINATION 
FACTORY SUPPLIED STANDARD TERMINATIONS POINTED DOWNWARD
INTAKE AIR
TERMINATION
MAINTAIN 12” (30 cm) 18” (45 cm) FOR CANADA MINIMUM CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL.
FIELD
SUPPLIED
STRAP/SUPPORT
VERTICAL TERMINATION(S) INSTALLATION
INTAKE AIR AND/OR VENT (EXHAUST)
Figure 19
9.Slide a roof boot or equivalent flashing over the pipe and secure roof boot or equivalent flashing to roof (see Figure 19) and seal around the flashing.
FIELD SUPPLIED
PLUMBING
ROOF BOOTS
OR FLASHINGS
VERTICAL TERMINATION - DIRECT VENT
STANDARD TERMINATIONS
Figure 21
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