Locating the New Water Heater (cont’d)
61⁄2″ MIN.
VENT OUTLET 24″ MAX.
″ 18
24″
45˚
AIR INTAKE
18″
NATURAL DRAFT (GRAVITY) DIRECT VENT, POWER VENT, OR POWER DIRECT VENT APPLIANCE INLET AND/OR OUTLET VENT(S).
Venting Through Roof – Clearances
•0″ clearance for 3″ PVC, ABS, or CPVC Schedule 40 piping from combustible and noncombustible surfaces.
•The vent exhaust outlet and air inlet terminals shall terminate at least 18 inches above the roof surface. Figure 7.
•The venting system must be installed in a manner which allows inspection of the installation of the venting pipes and joints as well as periodic inspection after installation as required by ANSI Standards.
45° VENT CAP | 90° STREET ELL |
W/SCREEN |
|
Figure 4
Must maintain adequate service and maintenance accessibility.
Range of degrees available for vent pipe installation.
Figure 5
WIRE FENCE
When the water heater outlet terminal is low enough to be touched accidentally, or is accessible to small children, a wire mesh chain link fence (as shown in Figure 6) may be used. Care should be taken to maintain adequate ventila- tion around the outlet terminal. If a chain link fence is installed, it must not be used as a storage area for items that may block proper ventilation.
NOT TO BE USED AS
A STORAGE AREA
18″
Figure 7
Air for Ventilation for
Appliances Located in
Confined Spaces
Air for ventilation should be provided if installed in a confined space. Refer to the National Fuel Gas Code, ANSI Z223.1.
Figure 6
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