26
ALTA
Combi Installation, Operating & Service Instructions
110327-07 - 2/23
1. Vent terminates outside building in elbow,
coupling, or end pipe pointing outward away
from wall and air terminal. Air terminates
outside building in downward-facing elbow.
Air terminal may be to left or right of vent
terminal. See Figures 8-2 and 8-4.
2. Screens on vent and air intake terminals are
generally recommended. Use 1/2 in. (12 mm)
mesh stainless steel for CPVC/PVC or listed
screens for polypropylene.
3. Vent terminal minimum 12 in. (305 mm) above
air terminal.
4. Required CPVC/PVC vent pipe and fittings
listed in Table 7-11. Polypropylene listed in
Tables 7-16 and 7-17.
8
Sidewall Direct Venting
(continued)
Figure 8-2: Fittings Terminal
Figure 8-4: Alternate Fittings Terminal
DuraVent
PolyPro
Centrotherm
InnoFlue
Selkirk PolyFlue
UV resistant
single wall pipe
+ two 2PPS-
E90BC elbows
+ 2PPS-BG
screen
UV stabilized
end pipe + two
ISELL0287UV
IASPP02 screen
UV resistant
pipe + two 2PF-
90UV elbows
+ 2PF-HVST
screen
Table 8-3: Polypropylene Sidewall Terminal Fittings
5. Assembly
A. Use appropriately sized wall thimble or a
sheet metal plate on building exterior to
maintain proper clearance and provide
weather tight seal.
B. If venting with polypropylene:
i. Use UV resistant or UV stabilized
components for all exterior pipe and
fittings.
ii. Remove gasket from terminal
fitting to install screen.
6. Brace exterior vertical runs of piping as required.
7. Seal exterior openings thoroughly with exterior
caulk.
Figure 8-5: CPVC/PVC Fittings Terminal Assembly
CPVC/PVC or Polypropylene Fittings
Terminal
WARNING
Asphyxiation Hazard.
All CPVC/PVC vent joints must be glued. Failure
to comply could cause products of combustion
and/or carbon monoxide to enter the building,
resulting in severe personal injury, death or
substantial property damage.
WARNING
Asphyxiation Hazard.
All propylene vent systems rely on gaskets
for sealing. Ensure gaskets are installed in
each female end of vent pipe or fitting. Failure
to make proper joint connections could
cause products of combustion and/or carbon
monoxide to enter building, resulting in severe
personal injury, death or substantial property
damage.
!
!
Grade or
snow line
12" (305mm) Min.
7' (2.1m) Max.
To boiler
vent connection
12" (305mm) Min.
To boiler
air connection
Elbow
Screen
Elbow
Screen
Wall Thimble
From boiler
vent connection
To boiler
air connection
12" (305mm) Min.
12" (305mm) Min.
Grade or
Snow line
From boiler
vent connection
PVC coupling
or polypropylene
end pipe
7' (2.1m) Max.
To boiler
air connection
Note: 2 in. (60 mm) components shown. Replace "2"
with "3" for 3 in. (80 mm) component part numbers.
