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(continued)
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” and 4” PVC Weil-McLain sidewall
vent cap, purchased separately. No additional screening is required.]
Figure24 — Use only the materials listed below, ensuring that all materials meet
local codes (see Figure 111, page 117 for part/kit numbers)
Part number 550-100-211/0122
– 21 –
220 /29 9/3 00 /39 9
Item Material
Standardsforinstallationsin:
UnitedStates Canada(Note 2)
Plasticpipingmaterials Ventorairpiping Ventpiping Airpiping
Ventorairpipe
&
ttings
PVC schedule 40 (Note 1) ANSI/ASTM D1785/UL1738/ULC S636 ULC S636
PVC, PVC-DWV,
CPVC or
polypropylene
PVC-DWV schedule 40 (Note 1) ANSI/ASTM D2665 N/A
CPVC schedule 40 (Note 1) ANSI/ASTM F441 / ULC S636 ULC S636
PVC&ABSpipe
cement&primer
PVC (Note 1) ANSI/ASTM D2564 / F656 / UL1738 ULC S636
Use only cement
and primer suitable
for piping material
used
CPVC (Note 1) ANSI/ASTM F493 ULC S636
CPVC to PVC transition
Use only cement and primer suitable
for piping material used
ULC S636
Polypropylene
ventpipe,ttings,
terminationsand
cement
Simpson-Duravent—Obtain all materials from M&G
Simpson-Duravent
CentrothermEcoSystemsInnoFlue®Single-wall
—Obtain all materials from Centrotherm
(Note: See page 117 for correct appliance adapters to be used.)
See manufacturer’s literature for detailed
information
MUST USE LOCKING COLLAR
ON EVERY JOINT
ULC S636
PVC, PVC-DWV,
CPVC or
polypropylene
AL29-4Cstainlesssteelpipingmaterials
Ventpipe
AL29-4C
stainless
steel
Heat Fab, Inc. — Saf-T-Vent
®
Z-Flex, Inc. — Z-Vent
Dura-Vent — FasNSeal™
Metal-Fab, Inc. — CORR/GUARD
Certied for Category IV and direct
vent appliance venting
Certied for Category IV and direct vent
appliance venting
Weil-McLainstainlesssteelbirdscreens,3”or4”(purchase separately) — see Figure 111, page 117 for part numbers
Note 1: Weil-McLain concentric vent kits are made from PVC
pipe and ttings.
Note 2: System 636 PVC concentric terminations utilize PVC
pipe/ttings certied to ULC S636.
If ULC S636 compliance is required, use only System
636 pipe, ttings and cement.
If UL1738 compliance is required, use only System
1738 pipe, ttings and cement.
DO NOT mix piping from dierent pipe manufactur-
ers unless using adapters specically 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 — AL29-4C piping — Install a PVC-to-stainless
adapter supplied by the AL29-4C stainless pipe manufac-
turer at the 4” PVC boiler vent connection. Can not be uesd
with Weil-McLain termination plate or concentric termina-
tion.
ADAPTERS — Polypropylene piping — Provide adapters
from polypropylene pipe to the 4” PVC connections at the
boiler and at terminations, if required (Weil-McLain side-
wall plate, for example).
ADAPTERS — If using 3” piping, where approved for the
application, provide adapters for the 4” PVC boiler con-
nections and at the terminations, if required (Weil-McLain
sidewall plate, for example).
For PVC – 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.
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