31
(e.g. PVC-2CT installation)
Exhaust
2 in. (50 mm)
or
3 in. (75 mm)
Intake
2 in. (50 mm)
or
3 in. (75 mm)
PVC-2CT
or
PVC-3CT
Plastic Rain Cap*
(PRC-1)
Increaser coupling*
* Not supplied with
Combi Boiler, order
separately.
12 in. (305 mm)
above grade or
over maximum
snow level.
≥ 3 ft Min.
3 in. (75 mm) pipe and 2 in. × 3 in. Increaser
coupling requires when using Plastic Rain
Cap.
3 in. (75 mm) pipe
2 in. (50 mm) pipe
2 in. × 3 in. Increaser coupling
• The combustion
air intake of any
appliance
• Any other building
opening
PRC-1
2 in. pipe**
3 in. pipe
3 in. pipe
2 in. × 3 in. Increaser
coupling
When using PVC-3CT, 3 in. (75 mm) pipe
and 2 in. × 3 in. Increaser couplings are
required.
Increaser couplings need to be used just
prior to 3 in. Concentric Termination.
** The length of the pipe between the
Increaser couplings and the
Exhaust and Intake Flue of the
Combi Boiler, and the concentric
termination vent pipe connections
should be up to 6 in. (152 mm).
For Vertical PVC Concentric Termination - PVC/CPVC Material Only
• The concentric termination may be shortened, but not lengthened from its original factory supplied length.
• 2 in. (50 mm) or 3 in. (75 mm) PVC or CPVC pipe may be used with the concentric termination.
Maintain the same vent pipe diameter from the Combi Boiler flue to 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. Refer to the page 4 for more detail information.
Venting the Combi Boiler
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