35
6.5.5 Vertical Vent Termination
Intake
Exhaust
2 in. (50 mm)
or
3 in. (75 mm)
2 in. SV
Conversion Kit
(SV-CK-2)
Inlet Screen
Hanger
Strap
Firestop
When the vent penetrates
a floor or ceiling and is not
running in a fire rated shaft, a
firestop and support is required.
≥ 3 ft Min.
Roof Flashing
Storm Collar
12 in. over
maximum
snow level
When the vent termination is located
not less than 8 ft (2.4 m) from a vertical
wall or similar obstruction, terminate
above the roof at least 2 ft (0.6 m), but
not more than 6 ft (1.87 m), in
accordance with the National Fuel Gas
Code ANSI Z223.1 / NFPA 54 or Natural
Gas and Propane Installation Code CSA
B149.1.
Provide vertical support
every 3 ft (0.9 m) or as
required by the vent pipe
manufacturer's
instructions.
• A short horizontal section is
required to prevent debris
from falling into the Combi
Boiler.
• When using a horizontal
section, slope the horizontal
vent 1/4 in. upwards for
every 12 in. (305 mm)
toward the termination to
drain condensate.
*
About the termination
• Insert Bird Screen in End of 90° Elbow.
Bird Screen is not supplied with Combi Boiler, order separately.
• To prevent excessive condensation formation, only the vent
termination should be located on the exterior of the building.
*
• The combustion
air intake of any
appliance
• Any other building
opening
2 in. × 3 in. Increaser coupling is
required when using 3 in. (75 mm) pipe.
* The length of the pipe between the
Increaser couplings and the Exhaust
and Intake Flue of the Combi Boiler
should be up to 6 in. (152 mm).
2 in. pipe*
3 in. pipe
2 in. × 3 in.
Increaser coupling
For SV Conversion Kit
Venting the Combi Boiler
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