User Guide

Plumbing Design Assistance Manual l Chapter 3 – Fire-resistant construction l 31
CAN/
ULC-S102.2
— surface
burning characteristics
As dened by the National
Building Code of Canada
(NBCC), combustible
piping may be installed
in areas required to be of
noncombustible construction,
provided the piping is installed
in a wall or concrete-oor slab
or the pipe has a ame-spread
(FS) index rating of not
more than 25 and a smoke-
developed (SD) index rating
of not more than 50 when
tested in accordance with
CAN/ULC-S102.2.
Uponor PEX-a piping systems
comprised of Uponor PEX-a
piping, Uponor ProPEX rings,
Uponor EP ttings, Uponor
LF brass ttings and Uponor
PEX-a pipe support products
are listed for installation in
return-air plenums as
tested in accordance with
CAN/ULC-S102.2.
The below listings apply to
Uponor PEX-a piping systems
installed in either horizontal
or vertical orientations in the
eld. Refer to Table 3-4 for
installation requirements.
QAI P321-1
½" Uponor PEX-a
(Uninsulated)
Adjacent runs of un-insulated
½" Uponor PEX-a piping in
a return-air plenum have no
spacing limitations.
¾" and 1" Uponor PEX-a
(Uninsulated)
Adjacent runs of uninsulated
¾" and 1" Uponor PEX-a
piping must be separated by
18".
QAI P321-1
Up to and including 3"
Uponor PEX (insulated)
Uponor PEX piping
manufactured with a maximum
nominal OD of 3" and encased
in ½" insulation in accordance
with Table 3-5 shall have no
limitation on spacing.
QAI P321-3
Up to and Including 2"
Uponor PEX-a (Water-lled,
Uninsulated)
Adjacent runs of water-lled,
uninsulated piping in a return-
air plenum have a no spacing
limitations.
Classified as to surface burning characteristics
CAN/ULC S102.2 Flame spread Smoke developed Limitations
½" nominal size 25 or less 50 or less No spacing limitations.
¾" and 1" nominal sizes 25 or less 50 or less Adjacent pipe runs shall be
located at least 18" apart.
2" maximum nominal size
(water-filled)
25 or less 50 or less No spacing limitations.
3" maximum nominal size
Uponor PEX-a with ½" insulation
25 or less 50 or less ½" minimum thickness insulation
as specified in Table 3-5.
Table 3-4: Uponor AquaPEX CAN/ULC-S102.2 requirements