Instructions / Assembly

®
System 1738 Installation Methods 3
Product Application
(a) System 1738 PVC Gas Venting System is intended for
venting of Categories II and IV gas fired appliances
(b) System 1738 PVC Venting System is suitable for a
maximum flue gas temperature of 149
o
F (65
o
C)
(c) System 1738 PVC has a zero clearance to
combustible construction
(d) Some custom System 1738
®
PVC fittings, fitting
assemblies and terminations manufactured for the
USA market are dual certified to both UL 1738 for
USA and ULC S636 for Canada. These components
are black in color and are identified with a UL 1738
and a ULC S636 marking on the certification
sticker found on the component. For installation
requirements of these components in Canada,
please reference the System 636
®
Installation
Manual at ipexna.com/Canada.
Limits of Use and Application
(a) The vent sizing and maximum vent length of plastic
piping for Categories II and IV appliances shall be
accordance with the appliance manufacturer’s
instructions.
(b) All System 1738 gas venting pipe and fittings must
be carefully inspected by qualified personnel before
use to ensure no damage has occurred during
transportation. Any damaged product must be
replaced. No attempt at repairs are to be made at
the job site.
(c) The common temperature changes in a gas venting
application will cause the system to expand and
contract accordingly. Proper care must be taken
to allow for this movement through walls, ceilings,
and roof penetrations. The venting system must be
supported in accordance with these instructions.
Follow IPEX solvent welding procedures as shown in
this guide, and check for proper joint construction
when joining pipe to fittings.
NOTICE
As per UL 1738 standard, DO NOT mix pipe, fittings or
joining methods from different Manufacturers as they
have different joint systems and adhesives. This can
result in unsafe conditions and will void certification
and warranty.
Improper installation of System 1738 PVC systems may
result in personal injury or death. Only qualified personnel
should attempt the installation of gas burning equipment
and vent, following the gas appliance and vent
manufacturers directions.
WARNING
(d) Only certified System 1738 PVC primer and cement
shall be used to assemble System 1738 PVC venting
systems.
(e) Venting should be as direct as possible with a
minimum number of fittings. The maximum vertical
rise or horizontal run of vent pipe plus the effective
length of all fittings in a single vent installation shall
not exceed the maximum vent length requirements
outlined in the appliance manufacturer’s installation
instructions.
(f) All framing requirements for floor and ceiling
penetrations shall be in accordance with the local
building code and/or the local regulatory authority.
(g) All penetrations of fire rated floors and walls shall be
firestopped as described in he Firestop section of
this guide.
(h) Roof penetrations should be sealed with a plumbing
roof boot or equivalent flashing as per the local
building code, or as permitted by the local regulatory
authority. Chemical attack can cause product
failure. Only use PVC chemically compatible sealants,
gaskets and adhesives.
(i) If spray foam insulation comes in contact with System
1738, it is recommended that foam be applied in a
maximum layer thickness of 2 inches (50mm) until the
required thickness of insulation is achieved.
(j) All horizontal sections of the venting system must
be installed with a slope not less than 0.25 in./
ft. down towards the appliance in order to collect
condensate and remove condensate generated
inside the line. The removal of condensate will help
reduce the possibility of ice buildup and blockage.
Refer to the appliance manufacturers’ installation
instructions for further details regarding the
installation of necessary condensate drains.
NEVER use compressed air or gas in
System 1738 pipe and fittings
NEVER test PVC pipe and fittings with
compressed air or gas, or air-over-water
boosters.
Use of compressed air or gas in System 1738 pipe
and fittings can result in explosive failures and cause
severe injury or death.
WARNING
System 1738
®
PVC Categories II and IV Gas Venting System is third party certified to UL 1738, latest edition. The following
installation methods have been prepared in conformity with the requirements of section 47 of UL Standard 1738.