16
18-CD29D1-11
Installer’s Guide
PVC VENT FITTING MATERIAL
These fittings are available from your Gas Furnace
Distributors.
Straight Pipe Sections, Couplings, 45° Elbows, 60° Elbows,
90° Elbows, Vent or Sanitary Tee, or other necessary fittings
may be 2", 2½", 3", or 4" diameter. The allowable materials are
shown in Table 10.
VENT FITTING MATERIAL – PLASTIC
Gas and liquid tight single wall vent fittings, designed for resis-
tance to corrosive flue condensate, MUST be used throughout.
Listed in Table 10 are designations for different types of 2" and
3" size pipe and fittings that meet these requirements. The ma-
terials listed are various grades of PVC, CPVC, ABS, and Du-
raVent PolyPro®.
ATTACHING VENT PIPING
Important: Products installed in Canada must use vent
systems that are certified to the Standard for Type BH Gas
Venting Systems (ULC S636) for Class II-A venting systems
(up to 65°C). Components of the vent system must not be
interchanged with other vent systems or unlisted pipe or
fittings. Plastic components, specified primers, and glues must
be from a single system manufacturer and not intermixed with
other system manufacturer's vent system parts. In addition, the
first three feet of the vent pipe must be visible for inspection.
PIPE JOINTS: All joints must be fastened and sealed to
prevent escape of combustion products into the building.
MANUFACTURED MODULAR VENTING SYSTEMS
▲
WARNING
!
CARBON MONOXIDE POISONING HAZARD
See Table 10 for manufactured modular venting systems
that are approved for use with this product. Follow the
manufacturer's installation instructions when installing the
venting system. Failure to follow this warning may result
in property damage, severe personal injury, or death.
TABLE 10
▲
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Do not use cement on polypropelene venting systems.
Follow the manufacturer's installation instructions when
installing the venting system. Failure to follow this
warning may result in property damage, severe personal
injury, or death.
For manufactured modular venting systems that are ap-
proved with this product see Table 10. Do not drill into
polypropelene venting pipes
BONDING OF PVC
NOTE:
It is recommended that the first joints from the furnace be
connected and sealed with high temperature RTV. This will
enable the pipes to be removed later without cutting.
Be sure to properly support these joints.
Commercially available solvent cement must be used to join
the pipe and fittings. Follow instructions on the container
carefully.
Procedure for Cementing Joints:
1. Cut pipe square, remove ragged edges and burrs.
Chamfer end of pipe, then clean fitting socket and pipe
joint area of all dirt, grease, moisture or chips.
2. After checking pipe and socket for proper fit, wipe sock-
et and pipe with cleaner-primer. Apply a liberal coat of
primer to inside surface of socket and outside of pipe.
DO NOT ALLOW PRIMER TO DRY BEFORE APPLY-
ING CEMENT.
3. Apply a thin coat of cement evenly in the socket. Quick-
ly apply a heavy coat of cement to the pipe end and in-
sert pipe into fitting with a slight twisting movement
until it bottoms out.
4. Hold the pipe in the fitting for 30 seconds to prevent
tapered socket from pushing the pipe out of the fitting.
5. Wipe all excess cement from the joint with a rag. Allow
APPROVED VENT PIPE MATERIALS
PLASTIC VENT PIPE DESIGNATIONS
PVC
ASTM STANDARD
PIPE TYPE
ALLOWABLE TEMPERATURE °F
MARKING
F891
CELLULAR CORE
1
158
ASTM F891
D2665
DWV PIPE
2
158
ASTM D2665
D1785
SCH 40, 80, 120
2
158
ASTM D1785
D2241
SDR SERIES
2
158
ASTM D2241
CPVC
ASTM STANDARD
PIPE TYPE
ALLOWABLE TEMPERATURE
MARKING
D2846
CPVC 41
2
212
ASTM D2846
F441
SCH 40, 80
2
212
ASTM F441
F442
SDR SERIES
2
212
ASTM F442
ABS
ASTM STANDARD
PIPE TYPE
ALLOWABLE TEMPERATURE
MARKING
D2661
SCH 40 DWV
3
180
ASTM D2661
F628
SCH 40 DWV CELLULAR CORE
3
180
ASTM F628
DuraVent PolyPro®
45
ASTM STANDARD
PIPE TYPE
ALLOWABLE TEMPERATURE
MARKING
NA
NA
230
ULC-S636
1
Allowable temperatures based on classifications covered in ASTM D4396 [Deflection Temps Under Load (264 PSI)]
2
Allowable temperatures based on classifications covered in ASTM D1784 [Deflection Temps Under Load (264 PSI)]
3
Allowable temperatures based on classifications covered in ASTM D3965 [Deflection Temps Under Load (264 PSI)]
4
This furnace family is approved for venting with DuraVent PolyPro® venting systems.
5
Canadian venting systems must be composed of materials that meet ULC-S636.
