Figure 22
Vent and air piping materials
— Use only the materials listed below, ensuring that all materials meet local
codes (
see Figure 159, page 117 for part/kit numbers).
USE SWEEP ELBOWS FOR ALL VENT AND AIR PIPING
— DO NOT use short
radius elbows for vent or air piping. Boiler performance could be affected.
ALL
vent and air pipes require a
BIRD SCREEN at each termination
. Most kits do not include
the bird screens. Purchase bird screens separately from Weil-McLain or vent kit supplier if
not included. [Note — bird screening is integral to the 3" PVC Weil-McLain sidewall vent
cap, available for purchase from Weil-McLain. No additional screening is required.]
Part number 550-100-305/0118
19
AquaBalance
TM
W
ALL
M
OUNT
GAS
-
FIRED
WATER
BOILER
—
Boiler Manual
6 Venting/air piping — general
continued
Item
Material
Standards for installations in:
United States
Canada
(Note 2)
Plastic piping materials
Vent or air piping
Vent piping
Air piping
Vent or air pipe
&
PVC schedule 40
ANSI/ASTM D1785
ULC S636
PVC, PVC-DWV,
CPVC or
polypropylene
PVC-DWV schedule 40
(Note 1)
ANSI/ASTM D2665
NA
CPVC schedule 40
(Note 1)
ANSI/ASTM F441
ULC S636
PVC & ABS pipe
cement & primer
PVC
ANSI/ASTM D2564/F656
ULC S636
Use only cement
and primer suitable
for piping material
used
CPVC
(Note 1)
ANSI/ASTM F493
ULC S636
Polypropylene
terminations and
cement
Simpson-Duravent —
Obtain all materials from
M&G Simpson-Duravent
Centrotherm Eco Systems InnoFlue® Single-
wall —
Obtain all materials from Centrotherm
See manufacturer’s literature
for detailed information
MUST USE LOCKING
COLLAR ON EVERY JOINT
ULC S636
PVC, PVC-DWV,
CPVC or
polypropylene
AL29-4C stainless steel piping materials
Vent pipe
AL29-4C
stainless
steel
Heat Fab, Inc. — Saf-T-Vent®
Z-Flex, Inc. — Z-Vent II
Dura-Vent — FasNSeal®
Metal-Fab, Inc. — CORR/GUARD
Certified for direct vent
appliance venting
Certified for direct vent appliance
venting
Stainless steel bird screens, 2” or 3”
(purchase separately) — see Figure 159, page 117
for part numbers
Note 1:
Weil-McLain concentric vent kits are made from PVC
pipe and fittings.
Note 2:
System 636 PVC concentric terminations utilize PVC
pipe/fittings certified to ULC S636.
If ULC S636 compliance is required, use only System
636 pipe, fittings and cement.
DO NOT mix piping from different pipe manufactur-
ers unless using adapters specifically designed for
the purpose by the manufacturer.
Every joint on
polypropylene vent piping
must
include a locking collar.
DO NOT use cellular core PVC (ASTM F891), cellular
core CPVC, or Radel® (polyphenolsulfone) in venting
systems.
DO NOT cover non-metallic vent pipe and fittings
with thermal insulation.
ADAPTERS
– Th e b o i l e r co m e s w i t h a 3 ”,
3-in-1 adapter as standard. This adapter allows the
installation of 3” PVC schedule 40, CPVC schedule 40,
PVC-DWV schedule 40, AL29-4C stainless steel and
Polypropylene (from Simpson-Duravent only) piping
without the need for extra adapters.
It may require an adapter at terminations.
If your venting system uses Centrotherm Eco
systems InnoFlue single wall material, then an ap-
proved adapter is required.
If using 2” piping (WMB-80/120 only), where ap-
proved for the application, provide adapters for a
3” pipe material (mentioned above) connections
and at the terminations, if required.
