29
Vertical Installation
Vertical venting
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.
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.
CAUTION
Failure to properly support the vent piping with hangers and clamps may result in damage to the water
heater or venting system.
Follow the procedure below to vent through the roof:
1. Cut the necessary holes through the roof and ceiling. Cut one 4 ½ in
(11.5 cm)
diameter hole for 4 in (
10.2
cm
) diameter pipe, one 3 ½ in
(8.9 cm)
diameter holes for 3 in
(7.6 cm)
diameter pipe, or one 6 5/8 in
(16.9
cm)
for 6 in (
15.2 cm
) diameter pipe.
2. Install the exhaust vent and air intake plastic pipes as shown in Figure 17. 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 17
– Typical Vertical Power Vent System Installation
Summary of Contents for LUHE120T
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