14
Vertical Vent Termination- PVC/CPVC Materials Only
Firestop
Firestop/Support
Roof
Flashing
Storm
Collar
Hanger
Strap
PVC/CPVC
Adapter*
*
Not supplied with water
heater, order separately.
•
•
•
•
•
•
•
Horizontal Vent Termination- PVC/CPVC Materials Only
•
•
•
•
•
•
•
PVC/CPVC
Adapter*
Hanger
Straps
**0.3m (1')
Minimum
Slope vent
Upwards
* Not supplied with water
heater, order separately.
**0.3m (1') minimum
recommended, but not required.
Insert Bird
Screen* in
Each End
of Tee
Support
Insert Bird
Screen* in
End of 45
°
Elbow
PVC/CPVC
Coupling
PVC/CPVC
Coupling
Slope vent
Upwards
Pipe Material PVC or CPVC
Max. Straight Vent Length***
3 4.6m (15')
0.9m (3')
No. of Elbows 100mm (4") Pipe 75mm (3") Pipe
2 8.2m (27')
3m (10')
1 12.0m (39')
5.1m (17')
Terminate at least 300mm (12") above
grade or above snow line.
Terminate at least 2.1m (7') above a public
walkway, 1.8m (6') from the combustion air
intake of any appliance, and 0.9m (3') from
any other building opening, gas utility
meter, service regulator etc.
Terminate at least 0.9m (3') above any
forced air inlet within 3m (10'), 1.2m (4')
below, 1.2m (4') horizontally from or 0.3m
(1') above any door, window, or gravity
air inlet into any building per National
Fuel Gas Code ANSI Z223.1/NFPA 54.
A tee or 45
°
elbow may be used for the
termination.
Slope the horizontal vent 1/4" upwards for
every 300mm (12") toward the termination.
Use a condensation drain if necessary.
In the Commonwealth of Massachusetts
a carbon monoxide detector is required
for all side wall horizontally vented gas
fuel equipment. Please refer to Technical
Bulletin TB 010606 for full installation
instructions.
**0.3m (1')
Minimum
**0.3m (1') minimum
recommended, but not required.
Terminate at least from the combustion air
intake of any appliance, and 0.9m (3') from
any other building opening, gas utility meter,
service regulator etc.
Enclose exterior vent systems below the
roof line to limit condensation and protect
against mechanical failure.
When the vent penetrates a floor or ceiling
and is not running in a fire rated shaft, a
firestop and support is required.
When the vent termination is located not
less than 2.4m (8') from a vertical wall or
similar obstruction, terminate above the
roof at least 0.6m (2'), but not more than
1.8m (6'), in accordance with the National
Fuel Gas Code ANSI Z223.1/NFPA 54.
Provide vertical support every 0.9m (3') or
as required by the vent pipe manufacturer's
instructions.
A short horizontal section is recommended
to prevent debris from falling into the water
heater.
When using a horizontal section, slope the
horizontal vent 1/4” upwards for every
300mm (12") toward the termination to
drain condensate.
***Not including the termination.
