Burnham ALPINE Installation, Operation And Service Instructions page 28

iV. Venting (continued)
Extend vent/combustion air piping to maintain minimum vertical ('X') and minimum horizontal ('Y') distance of
twelve (12) inches (18 inches Canada) from roof surface. allow additional vertical ('X') distance for expected
snow accumulation.
• Install Rodent Screen and Vent Terminal
(supplied with boiler), see Figure 9 for
appropriate configuration.
• Brace exterior piping if required.
Combustion Air Piping
ii.
• Locate combustion air termination
on the same roof location as the vent
termination to prevent nuisance boiler
shutdowns. Combustion air terminal can
be installed closer to roof than vent.
• Size roof opening to allow easy insertion
of combustion air piping and allow
proper installation of flashing and storm
collar to prevent moisture from entering
the structure.
- Use appropriately designed vent
flashing when passing through roofs.
Follow flashing manufacturers'
instructions for installation
procedures.
- Extend combustion air pipe to
maintain minimum vertical and
horizontal distance of twelve (12)
inches from roof surface. Allow
additional vertical distance for
expected snow accumulation.
Provide brace as required.
28
Figure 12: Direct Vent - Vertical Terminations
with Sloped Roof
- Install storm collar on combustion
air pipe immediately above flashing.
Apply Dow Corning Silastic 732
RTV Sealant between combustion
air pipe and storm collar to provide
weather-tight seal.
• Install Rodent Screen and Combustion
Air Terminal (supplied with boiler), see
Figure 9 for appropriate configuration.
• Brace exterior piping if required.
WaRning
all CPVC supplied with the vent kit must be
used prior to connection of the vent system to
this terminal. if the vent system is too short
to permit this, do not use this terminal.
Do not operate boiler without the rain cap in
place.
Methods of securing and sealing terminals
to the outside wall must not restrain the
thermal expansion of the vent pipe.