12
When a vent riser is necessary, it may produce excessive
condensation in the vent system, so consideration must
be taken to slope the vent piping (down) toward the water
heater to prevent condensate water from collecting in any
part of the vent system. Refer to the
Condensation in
the Venting System
section in the installation manual.
Figure 12
Vent Termination through-the-Roof
PVC AND CPVC VENT SYSTEM:
PolyPro
®
InnoFlue
®
A 90-degree elbow (not supplied) shall be used as the
termination elbow for Through-the-Roof installation
(
see Figure 8
). Use a 90-degree elbow that is
made of the same material as the vent system and
approved to be used with this vent system. Be sure
to remove the wire mesh screen that was supplied
with the 45-degree PVC elbow and insert it into the
90-degree elbow. Push the screen until it locks in
place inside the elbow.
POLYPROPYLENE VENT SYSTEM:
PolyPro
®
InnoFlue
®
PolyPro
®
InnoFlue
®
A 90-degree polypropylene elbow, approved to be
used with the vent system shall be used as the termination
elbow for through-the-roof installation. Be sure to remove
the wire mesh screen that was supplied with the 45-degree
PVC elbow and insert it into the polypropylene elbow.
Push the screen until it locks in place inside the elbow.
DANGER
WARNING
CAUTION
AVERTISSEMENT
ATTENTION
Check that all openings and gaps in the outside
wall or roof near and around where the vent pipe
pass through the exterior wall are sealed to prevent
infiltration of combustion products into the building.
DANGER
WARNING
CAUTION
AVERTISSEMENT
ATTENTION
In freezing weather, check for snow accumulation
around the water heater vent terminal where it
passes through the outside wall or roof. The open
end of the terminal must be installed at least twelve
(12) inches (30.5 cm) above the highest anticipated
snowfall to prevent blockage by snow.
Restrictor Screens
Figure 13
PVC AND CPVC VENT SYSTEM:
PolyPro
®
InnoFlue
®
A black restrictor screen (
see Figure 13
) is provided with
the water heater. When the total equivalent vent length is
twenty-five (25) feet (7.6 m) or less of three (3) inch (7.6
cm) vent pipe, the wire mesh screen shall be removed from
the vent termination elbow and the three (3) inch (7.6 cm)
black restrictor screen supplied with the water heater, must
be installed and glued. Otherwise, a standard wire mesh
screen shall be installed. When using four (4) inch (10.2
cm) vent pipe, a standard wire mesh (supplied with the
water heater) must be installed in all cases (
see Table 4
).
POLYPROPYLENE VENT SYSTEM:
PolyPro
®
InnoFlue
®
PolyPro
®
InnoFlue
®
A grey restrictor screen (
see Figure 13
) is provided
with the water heater. When the total equivalent vent
length is twenty-five (25) feet (7.6 m) or less of three (3)
inch (7.6 cm) vent pipe, the three (3) inch (7.6 cm) grey
restrictor screen supplied with the water heater, must be
installed. Otherwise, a standard wire mesh screen shall
be installed. To install the restrictor screen, remove the
gasket at the end of the termination elbow and insert the
restrictor screen. Push firmly the screen into the elbow
INSTALLATION INSTRUCTIONS
Table 4
VENT DIAMETER
TERMINATION
0’ - 25’ (0 - 7.6 m)
25’ - 50’ (7.6 - 15.2 m)
3” (7.6 cm)
45-DEGREE ELBOW
VENT DIAMETER
TERMINATION
0’ - 180’ (0 - 54.9 m)
4” (10.2 cm)
45-DEGREE ELBOW
