Instructions / Assembly

3. Termination Requirements (positive pressure venting)
(a) Installation and location of terminations must be in accordance with the latest edition of
appliance manufacturer’s installation instructions, local building code requirements and
CSA B149.1 Natural Gas and Propane Installation Code.
(b) Intake and vent pipes may be routed either horizontally through an outside wall
(see Figure 1) or vertically though the roof (see Figure 2).
(c) To avoid recirculation of exhaust gas on roof terminations, the end of the vent pipe must be
higher than the intake pipe. The minimum vertical separation between the end of the vent pipe
and the end of the intake pipe is 8 inches (see Figure 2).
(d) The runs of intake and vent pipes for terminations in general should be installed as close
together as possible. Specific spacing limits are 3" maximum separation for roof
penetrations and 6" maximum separation for wall penetrations (see Figures 1, 2 & 3).
(e) Terminate the vent piping straight up when through a chimney or fortified
penetrations (see Figure 2). For wall penetrations, the vent should be straight out or
elevated (see Figure 3).
(f) Intake piping terminating through the roof must terminate straight down through the
use of two 90° elbows (see Figure 2). On wall terminations intake piping should
point straight down through the use of one 90º elbow. (see Figure 1).
System 636 Installation Methods
3
8" MINIMUM
12" MAXIMUM
Insulation in
unconditioned
space
Reducer coupling
Insulation
Outside Wall
2" 90º Elbow
Top View
T
yp
ical Wall Termination
6" MAX
separation
Vent
Intake
8" MIN.
Separation
Typical Roof Termination
3" MAX separation
Insulation in
unconditioned
space
Reducer Coupling
Approved Penetration
and Flashing as per
Building Code
Unconditioned
Attic Space
12" Above avg.
snow accumulation
Provide support for
intake and vent lines
Install condensate drain
as per appliance
manufacturer’s
recommendations
VentIntake
Figure 1
Figure 2