11
be used with the vent system. A wire mesh screen must be
installed in the termination elbows.
POLYPROPYLENE VENT SYSTEM:
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.
WARNING
In freezing weather, check for snow accumulation around
the water heater vent and air intake terminals where they
pass through the outside wall. The open ends of the ter-
minals must be installed at least twelve (12) inches (30
cm) above the highest anticipated snowfall to prevent
blockage by snow.
WARNING
Check that all openings and gaps in the outside wall near
and around where the vent and air intake pipes pass
through the exterior wall are sealed to prevent infiltration
of combustion products into the building.
Restrictor Screens
PVC & CPVC VENT SYSTEM:
Two (2) black restrictor screens (two (2) inches (5.1 cm)
and three (3) inches (7.6 cm)) are provided in the box (see
Figure 9). The two (2) inch (5.1 cm) restrictor screen must
be installed in the vent termination elbow when total equiva-
lent length is thirty (30) feet (9.1 m) or less, otherwise a
standard wire mesh screen shall be installed. When using
a three (3) inch (7.6 cm) vent, the three (3) inch (7.6 cm)
restrictor screen must be installed in the vent termination
elbow in all cases.
When using a two (2) inch (5.1 cm) concentric vent system
from IPEX, be sure to install the two (2) inch (5.1 cm) black
restrictor screen from 0 to twenty-five (25) feet (7.6 m). If
using the three (3) inch (7.6 cm) concentric vent system
from IPEX, be sure to install the three (3) inch (7.6 cm)
black restrictor screen in all cases.
POLYPROPYLENE VENT SYSTEM:
PolyPro
®
InnoFlue
®
Two (2) grey restrictor screens (two (2) inches (5.1 cm)
and three (3) inches (7.6 cm)) are provided in the box (see
Figure 9). The two (2) inch (5.1 cm) restrictor screen must
be installed in the vent termination elbow when total equiva-
lent length is thirty (30) feet (9.1 m) or less, otherwise a
standard wire mesh screen shall be installed. When using
a three (3) inch (7.6 cm) vent, the three (3) inch (7.6 cm)
restrictor screen must be installed in the vent termination
elbow in all cases. 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 pass
the gasket groove. Put the gasket back into place.
The air intake screen can be removed on the air intake
terminal in cold environment. Thus, this may make the air
intake susceptible to debris build-up in the air intake pipe.
A second screen is installed in the rubber adaptor on the air
inlet at the back of the water heater to prevent debris from
entering the water heater. This screen can be accessed for
cleaning by removing the pipe on top of the rubber adaptor.
If the air intake screen is removed to prevent freezing, it is
recommended that the air inlet screen be installed during
the spring.
Figure 9
INSTALLATION INSTRUCTIONS
minimum vent to 30’ (9.14 m)
30’ (9.14 m) to 50’ (15.2 m)
minimum vent to maximum of 80’ (24.4 m)
VENT TERMINAL AIR INTAKE TERMINAL
VENT
SIZE
EQUIVALENT LENGTH
2”
(5.1 cm)
3”
(7.6 cm)
Table 4
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