Pavilion PV199DV Installation Manual page 30

6.4.3 Vertical Vent Termination
For Vertical Vent Termination - PVC, CPVC or PP Material
*
About the termination
• When choosing intake and exhaust terminations, you must use the same type of elbow (i.e.
both 90° elbows).
This will help with proper combustion by putting both terminations in the same pressure zone.
• 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.
Roof Flashing
When the vent
penetrates a floor or
ceiling and is not
running in a fire rated
shaft, a firestop and
support is required.
Provide vertical
support every 3 ft
(0.9 m) or as
required by the vent
pipe manufacturer's
instructions.
Intake
2 in. (50 mm)
3 in. (75 mm)
2 in. × 3 in. Increaser couplings are
required when using 3 in. (75 mm)
pipe.
3 in. pipe
2 in. × 3 in. Increaser
coupling
2 in. 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).
30
Venting the Combi Boiler
Storm Collar
or
≥ 3 ft Min.
*
12 in. over
maximum
snow level
Support
Firestop
Support
Firestop
Hanger
Strap
2 in. (50 mm)
3 in. (75 mm)
• 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.
≥ 3 ft Min.
*
Storm
12 in. over
Collar
maximum
Roof
snow level
Flashing
When the vent termination
is located not less than 8 ft
(2.4 m) from a vertical wall
Firestop
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.
Firestop
Exhaust
or
• The combustion
air intake of any
appliance
• Any other building
opening