Bradford White EF120T Installation & Operation Manual With Troubleshooting Manual page 24

Vertical Installation
Vertical venting 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 direct venting through the roof:
1. Cut the necessary holes through the roof and ceiling. 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 6 5/8 in
(16.9 cm) diameter holes for 6 in (15.2 cm) diameter pipe in the ceiling and roof.
2. Install the exhaust vent and air intake plastic pipes as shown in Figure 13. 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 12 – Typical Horizontal Power Direct Vent System
CAUTION
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