Bradford White EFTM Installation & Operating Manual page 22

Internet Version for Reference Only
2. Use the proper PVC cement to secure the 90° exhaust vent and air intake terminals provided with the water
heater to the plastic pipes. The distance between the back edge of the 90° exhaust vent terminal and the
exterior wall (see Figure 13) must be 6 inches (12.7 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 feet (.91 m) of horizontal
vent.
Vertical Installation:
Vertical venting system must be supported every 5 feet of vertical run and every 3 feet 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 to vent through the roof:
1. Cut the necessary holes through the roof and ceiling
2. Install the exhaust vent and air intake plastic pipes as shown in Figure 14. Make sure that the installation
meets the local codes and/or The National Fuel Gas Code ANSI Z223.1 (Latest Edition) or CGA/CAN B149
Installation Code.
Figure 13. Typical Horizontal Direct Vent System
CAUTION
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