John Wood Noritz Concentric Vent - NR98-DVC (N-0751M) - Manual (Page 13)

13
Suggested inspection openings
450mm x 450mm (18" x 18")
(Combustible material)
External wall,
combustible material
• Inspection openings are suggested for the vent intake and exhaust
pipes if they are installed in an enclosure. These openings should
be near the entrance and exit of the vent into the enclosure.
• These openings should be 450mm x 450mm (18" x 18").
When the vent pipe passes through an enclosed space:
Ceiling
Sloping down toward vent terminal
Vertical Vent Termination
Firestop
Firestop/
Support
Roof Flashing
(Base and Adapter)
Air Intake
Pipe
Rain
Cap
1.5m (5') or more
Hanger
Strap
Elbow
* Install a condensate drain if
the total vertical run exceeds
0.9m (3').
Slope vent
Upwards
Condensation
Drain (Install
According to
Local Codes)*
• Terminate at least 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.
• 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.
• Terminate the vent system at least 0.6m (2')
above, but not more than 1.8m (6') above the
roof line.
• Terminate the vent system at least 0.6m (2')
above any portion of a building located within
3m (10') horizontally.
• Provide vertical support every 2.1m (7').
• Slope the horizontal vent 1/4" for every 300mm
(12") towards the drain tee.
• Install a condensate drain directly on the water
heater flue if the total vertical run exceeds 0.9m
(3') .
• When 2 units are installed in a Quick Connect
Multi System, maintain a minimum distance of
1.5m (5') between the vertical terminations.