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Vent pipes serving power vented appliances are classified by building codes as “vent connectors”. Required clearances
from combustible materials must be provided in accordance with information in this manual under LOCATION OF WATER
HEATER and CLEARANCES, and with National Fuel Gas Code and local codes.
Horizontal Installation
In a horizontal application, it is important that moisture is not to be allowed to buildup in the intake vent pipe. To prevent
this from happening, the pipe should be installed with a slight downward slope so the moisture will run back away from the
water heater. The vent system
must be
supported every 5 feet of vertical run and every 3 feet of horizontal run of vent
pipe length.
CAUTION
Failure to properly support the vent piping with hangers and clamps may result in damage to the water heater or venting
system.
Figure 4. Typical Horizontal Intake Vent System.
Clearance to combustibles for all venting pipes and terminals
For installations in the US
0” minimum
For installations in the CANADA
Refer to vent pipe and terminal manufacturer’s installation
instructions for clearances to combustibles
DO NOT place insulation or other materials in the required clearance spaces between the venting to combustible material unless
otherwise specified.
WARNING! DO NOT USE 2”
VENT WITH UCG100H399
MODELS
