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FIGURE 4
WARNING
Vent termination must not be within 4 feet of any items such as
gas meters, gas valves or other gas regulating equipment.
OPTIONAL WIRE GRILL
When the water heater vent cap is low enough to be touched
accidentally, or is accessible to small children, installation of a
protective vent cover is recommended. Some local codes may
require a vent cap cover. Figure 9 shows the optional wire vent
cap protector available from the water heater manufacturer.
A wire mesh chain link fence (as shown in Figure 9) may be
used instead of the factory cover. Care should be taken to
maintain adequate ventilation around the vent cap. If a chain
link fence is installed, it must not be used as a storage area for
items that may block proper ventilation.
FIGURE 5
FIGURE 3A
COMBUSTION AIR AND VENTILATION
When determining the installation location for a direct vent
water heater, snow accumulation and drifting should be
considered in areas where applicable.
VENTING CLEARANCES
• 18” minimum in all directions from any obstruction that may
interfere.
• 18” minimum from the ground and 12” from ceiling
overhangs, see Figure 4.
• The direct vent terminal shall terminate at least 3 feet above
any forced air inlet located within 10 feet, see Figure 5.
• 9” minimum horizontally from or above any door, window or
gravity air inlet into the building (50,000 BtuH input or less.)
• 12” minimum horizontally from or above any door, window or
gravity air inlet into the building (over 50,000 BtuH input).
• 12” minimum below any door, window or gravity air inlet into
the building (50,000 BtuH input or less).
• 18” minimum below any door, window or gravity air inlet into
the building (over 50,000 BtuH input).
• 18” minimum from other gravity or natural appliance outlet
vents when directly above or 135° to either side of center
line, see Figure 6.
• 36” minimum from any outlet vents when directly below or
45° to either side of center line, see Figure 7.
• 36” minimum in all directions from any other forced air
appliance outlet vent, see Figure 7.
• The location selection must provide clearances for
servicing and proper operation of the water heater, see
Figure 8.
• Vent termination must not be within 4 feet of any items such
as gas meters, gas valves or other gas regulating
equipment.