Sterling GG - Manual (Page 6)

Figure 6 - Vertical Vent Termination
VERTICAL TERMINATION
Select location on roof for vent terminal, ensuring ade-
quate space inside the building/structure for combustion
air inlet box. Terminal must be at least 10 feet (3.04m)
from any wall or adjacent building or parapet (See Table
1).
Cut a hole through the roof for a 6 inch (152mm)
combustion air pipe. Combustion air inlet box is to be
suspended from the underside of the roof using suitable
brackets (fi eld supplied). Before mounting box, cut a
length of 6 inch pipe so that dimension A (see Figure 6)
is equal to the dimension from the top of the box to the
roof surface plus 2 feet (0.61m) or plus expected snow
depth, whichever is greater. Fasten 6 inch pipe to
combustion air inlet connection of combustion air inlet
box and seal joint. Insert pipe through roof and fasten
vent box in place. Flash and/or caulk 6 inch pipe to roof.
Install inlet air screen assembly and fasten to 6 inch
pipe with screws. Insert a 5 foot length (1.5m) of UL
1738 listed vent pipe through the 4-3/4 inch opening
with the “UP” arrow pointing up. Position the pipe to
extend 12 inches (305mm) beyond the inlet air screen.
Seal the space between the vent pipe and opening of
combustion air inlet box using high temperature silicone
sealant. Install defl ector disk on UL 1738 listed vent pipe
2-1/2 inches above inlet air screen and fasten with
screws. Seal joint between defl ector disk and pipe with
silicone sealant. Install vent terminal on top of UL1738
listed vent pipe, fasten with screws and seal joint (see
Figure 6).
Connect fl ue pipe and combustion air pipe from
combustion air inlet box to unit following “Venting”
instructions on pages 7 and 8. Joint between UL 1738
listed vent pipe and single wall vent pipe must be sealed
with high temperature silicone sealant.
Collars on unit and on combustion air inlet box are sized
so that crimped ends of combustion air pipes go toward
the unit and crimped ends of fl ue pipes go away from
the unit.
Never use pipe other than 4 inch
diameter. Never use PVC, ABS or any other
nonmetallic pipe for venting! To do so may result in
serious damage to the unit and or severe personal
injury or death!
6