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12
20356 Rev R
08-03
G136 SERIES INSTALLATION INSTRUCTIONS
a. Assembling Vent Sections
Attach a straight vent section to the top of the
appliance. Elbows directly off the top of the
appliance are allowed but are strongly not
recommended. This may cause the appliance to
operate ineffectively. Secure the attached vent
section to the appliance with the three screws
supplied. Use only B-vent sections.
b. Using Elbows
Elbows exceeding 45 degrees from the vertical
shall be considered horizontal and therefore
adapt horizontal run limitations. Each such elbow
shall be considered the equivalent of 2 feet of
horizontal run. See Figure 6.
c. Penetrating the Ceiling
Mark and cut out an opening in the ceiling for the
firestop spacer. Frame the opening with the same
size lumber used in the ceiling joists.
d. Installing the Firestop Spacers
Firestop spacers must be used whenever the
venting penetrates a ceiling/floor area.
In all situations, firestop spacers are to be nailed
to the ceiling joists from the bottom or appliance
side, EXCEPT when the space above is an
insulated ceiling or attic space. In this situation,
the firestop spacer must be nailed from the top
side to prevent loose insulation from falling into
the required one inch air space around the vent
system.
Install the firestop spacer by positioning and
nailing the four sides of the firestop spacer to the
joists using a minimum of three nails per side.
e. Securing Vent System
Continue assembling the vent sections up
through the firestop spacers as needed. Vent
sections must be locked into position. Elbows
and chimney stabilizers have straps for securing
these parts to joists or rafters.
f.
Marking the Exit Point in the Roof
Locate the point where the venting will exit the
roof by plumbing down to the center of the vent
system. Drive a nail up through the roof to mark
the center. See Figure 7.
Note:
Be sure to provide intermediate support for the
vent during construction and check to be sure inadvert-
ent loading has not dislodged the vent from the appli-
ance or any vent joint.
WARNING!
When vent sections exceeding 3 feet in length are
installed between an offset and return, structural
support must be provided to reduce off-center load-
ing and prevent vent sections from separating at the
vent joints. Follow all B-Vent manufacturer guide-
lines.
Figure 6 - Using Elbows
Figure 7 - Exiting Through the Roof