Bradford White EF120T Installation & Operation Manual With Troubleshooting Manual page 23

The vent system must terminate so that proper clearances are maintained as cited in local codes or the latest
edition of the National Fuel Gas Code, ANSI Z223.1:
1. Do not terminate near soffit vents or crawl space or other area where condensate or vapor could create a
nuisance or hazard or cause property damage.
2. Do not terminate the exhaust vent terminal where condensate or vapor could cause damage or could be
detrimental to the operation of regulators, relief valves, or other equipment.
3. Do not terminate the exhaust vent terminal over public area or walkways where condensate or vapor can
cause nuisance or hazard.
4. The vent shall terminate a minimum of 12 inches above expected snowfall level to prevent blockage of vent
termination.
5. The manufacturer requires the centerline distances between the air intake and exhaust vent terminals to be
a minimum of 36 inches apart and the exhaust terminal must extend 6 inches past the air intake terminal.
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
Locating the Water Heater and Clearances, and with National Fuel Gas Code and local codes.
For installations in the US
DO NOT place insulation or other materials in the required clearance spaces between
the venting to combustible material unless otherwise specified.
Horizontal Installation
In a horizontal application, it is important that condensate NOT be allowed to buildup in the exhaust vent pipe.
To prevent this from happening, the pipe should be installed with a slight upward slope, so the condensate will
run back toward the water heater. The vent system must be supported every 5 ft (1.5 m) of vertical run and
every 3 ft (.92 m) of horizontal run of vent pipe length.
Failure to properly support the vent piping with hangers and clamps may result in damage to the water
heater or venting system.
Stress levels in the pipe and fittings can be significantly increased by improper installation. If rigid pipe clamps
are used to hold the pipe in place, or if the pipe cannot move freely through a wall penetration, the pipe may be
directly stressed, or high thermal stresses may be formed when the pipe heats up and expands. Install
accordingly to minimize such stresses.
Follow the following procedure for power direct venting through the wall:
1. Cut two 4 ½ in (11.4 cm) diameter holes for 4 in (10.2 cm) diameter pipe, two 3 ½ in (8.9 cm) diameter
holes for 3 in (7.6 cm) diameter pipe, or two 6 5/8 in (16.9 cm) diameter holes for 6 in (15.2 cm) diameter
pipe in the wall. The centerline hole distances must be at least 36 in (91.4 cm) apart in the location where
the exhaust vent and air intake terminals will exit the outside wall, if vented on the same wall.
Use the proper cement to secure the exhaust vent and air intake terminals provided with the water heater
2.
to the pipes. The distance between the back edge of the exhaust vent terminal and the exterior wall (see
Figure 12) must be 6 in (15.2 cm) more for the exhaust vent terminal than the air intake terminal. Use the
proper cement or sealant and assembly procedures to secure the vent connector joints between the
terminal and the blower outlet. Provide support brackets for every 3 ft (.92 m) of horizontal vent beyond
the intake terminal.
Clearance to combustibles for all venting pipes and
0" minimum
terminals
For installations in the CANADA
Refer to vent pipe and terminal
manufacturer's installation instructions
for clearances to combustibles.
CAUTION
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