Wire Fence; Air For Ventilation For Appliances Located In Confi Ned Spaces; Insulation Blankets - A.O. Smith GPD-40 Instruction Manual

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 8) may be used. Care should be taken to
maintain adequate ventilation 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.
Venting Through Roof - Clearances
• 0" clearance for 3" PVC, ABS, or CPVC Schedule 40 piping from
combustible and noncombustible surfaces.
VENT TERMINATION CLEARANCES
FIGURE 8.
FIGURE 7.
• The vent exhaust outlet and air inlet terminals shall terminate at
least 18" (45.7 cm) above the roof surface, see Figure 9.
AIR FOR VENTILATION FOR APPLIANCES LOCATED IN
CONFINED SPACES
Air for ventilation should be provided if installed in a confi ned space.
Refer to the National Fuel Gas Code, ANSI Z223.1.

INSULATION BLANKETS

Insulation blankets are available to the general public for external use
on gas water heaters but are not necessary with these products. The
purpose of an insulation blanket is to reduce the standby heat loss
encountered with storage tank heaters. Your water heater meets or
exceeds the National Appliance Energy Conversation Act standards
with respect to insulation and standby loss requirements, making an
insulation blanket unnecessary.
10
.........
FIGURE 9.