32
ALTA
Installation, Operating & Service Instructions
110327-02 - 7/20
Abandoned B-vent Chase
WARNING
Asphyxiation Hazard.
• Only abandoned (unused) B-vent may
be used as a chase. Failure to comply
may cause product damage or improper
operation resulting in severe personal injury,
death or substantial property damage.
• Do not use flexible polypropylene outside of
B-vent chimney. Failure to comply may cause
product damage or improper operation resulting
in severe personal injury, death or substantial
property damage.
1. Abandoned B-vent may be used as an air chase
with flexible polypropylene vent pipe only if all of
the following conditions are met:
A. B-vent must be clean and in good condition.
B. B-vent inside diameter 6 in. (150 mm) or
larger.
C. All B-vent joints and seams must be sealed
with RTV silicone.
Use DuraVent or Centrotherm concentric terminal
and flexible polypropylene listed in Table 9-11 to
terminate air and vent outside building per Figure
9-12 and 9-13.
NOTICE: Selkirk components may only be used
with a sidewall air termination.
2. If any of above conditions is not met,
terminate air piping through sidewall using PVC or
polypropylene fittings per Figure 9-14.
3. Required vent pipe and fittings listed in Tables
7-16 and 7-17.
4. Do not count concentric termination when
calculating equivalent length.
5. Follow terminal manufacturer instructions for
assembly.
6. Air connection for B-vent air chase:
A. Install tee same size as B-vent on base of
B-vent with cap in side of tee. Connect PVC
air pipe to side of tee using a PVC socket x
male thread adapter. Cut clearance hole
in cap, insert PVC adapter, and install
electrical conduit locknut to secure. Seal
all joints with RTV silicone.
B. DuraVent: Install PolyPro lower B-vent adapter
in base of tee.
C. Centrotherm: Install cap in base of tee.
Route smooth section of InnoFlue flex
through cap in base of tee. Use wall plate and
RTV silicone to seal this penetration.
Polypropylene Concentric Terminal
WARNING
Asphyxiation Hazard.
All polypropylene 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 the building, resulting in
severe personal injury, death or substantial
property damage.
1. Concentric terminals listed in Table 9-9 may be
used to terminate air and vent outside building
per Figure 9-10. Both air and vent pipes must
attach to terminal kit.
2. Required vent pipe and fittings listed in Tables
7-16 and 7-17.
3. One polypropylene to PVC adapter required.
Install at terminal air pipe connection if using PVC
air pipe. Install at boiler air connection if using
polypropylene air pipe.
4. Follow terminal manufacturer instructions for
assembly.
!
9 Vertical Direct Venting (continued)
Table 9-9: Polypropylene Concentric Vertical
Terminal Components
Length
DuraVent
PolyPro
Centrotherm
InnoFlue
Selkirk
PolyFlue
2 in.
(60
mm)
2PPS-VKC
(Black or
2PPS-VK-TCC
(terracotta)
ICRT2439
terminal +
ICTCR24 two-
pipe adapter
2PF-VCT
terminal +
2PF-CTA two-
pipe adapter
3 in.
(80
mm)
3PPS-VKC
(black) or
3PPS-VK-TCC
(terracotta)
ICRT3539
terminal +
ICCT3503 two-
pipe adapter
3PF-VCT
terminal +
3PF-CTA two-
pipe adapter
Figure 9-10: Polypropylene Concentric Terminal
!
12" (305mm) Min.
Roof or
Snow line
To boiler
air connection
From boiler
vent connection
Polypropylene Concentric
Vertical Terminal
(DuraVent shown)
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