Instructions / Assembly

®
System 1738 Installation Methods 9
Chimney Terminations
If System 1738 piping is installed through an existing
unused chimney space, installers shall adhere to the
following guidelines when doing such installations:
(a) Vent pipe sizing to be as per appliance
manufacturers’ instructions or appliance
manufacturer’s technical manual.
(b) NO existing non-certified vent piping shall be used
or re-used for venting. They shall all be replaced
with System 1738 as required.
(c) The chimney space shall be cleaned prior to
installation to remove any debris, creosote, or other
material.
(d) All recommended practices for solvent welding
must be observed in the same manner as regular
System 1738 installations. Refer to solvent welding
basic principles and installation steps within this
guide.
(e) Multiple vent pipes are permitted in one chimney
space as limited by the interior available cross-
sectional area. Zero clearance is permitted between
multiples runs of System 1738 piping or other
combustibles. (see Figure 12).
Figure 12: Chimney Termination
To Termination
Clamp to be snugly fit but allowing
pipe travel due to expansion
Coupling to sit on riser clamp to
support weight or section above
From Appliance
Chimney Installations
(f) Fresh air intakes may also be installed within
existing unused chimney spaces providing
acceptable spacing and clearance is obtained
at the termination as per appliance manufacturer
requirements.
(g) Vertical piping through the chimney space or any
other vertical spaces exceeding 20 feet is to be
structurally supported by use of a pipe coupling
installed immediately above and sitting upon a
snugly fit pipe clamp. One of these pipe coupling
and pipe clamp combinations is to be installed
at the entrance of the chimney space to support
the pipe weight. The clamp at the entrance of the
chimney is to be rigidly fixed against the wall or floor
(see Figure 12). Should the pipe run exceed 60 feet
inside the chimney space, please contact IPEX for
further requirements.
(h) It is recommended to install an air-tight seal as
required at the chimney exit to prevent entry of
water, snow, moisture or cold air.