Install Instructions
4
Type B Gas Vent - 3” to 12” Diameter
Installation Instructions
Round Support Plates
The Round Support Plate (RSP) is designed for use
with 9- inch diameter and larger Type B Gas Vent.
Each support is designed to support up to 30 feet of
Vent Pipe when installed as follows.
1. It is recommended that the Vent Pipe be supported
at least every other floor. The distance between
supports must not, in any case, exceed 30 feet.
2. The circular cutout in the Round Support Plate is
designed to engage the recess in the female end
of the Vent Pipe. See Figure 6.
Figure
6
3. Surround the Vent Pipe with the two identical
Support Plate halves. See Figure 7. Engage the
plate edges in the pipe recess as described in
Step 2. Use two pair of bolts and nuts to hold the
plate halves together. (Four predrilled tabs are
provided for this purpose.)
4. Mounting holes are provided around the
perimeter of the Round Support Plate. Use
appropriate fasteners to secure the Support Plate
halves to the opening between floors. (Round
Support Plates should be attached to the TOP of
the opening only.)
Figure
7
RECESS
5. For installations with multiple supports, an
Adjustable Length Section of Type B Gas Vent
should be installed be-tween each pair of locations
where a support is used. See Figure 5. This
allows
the location of the pipe recess to be in the
proper position at each opening where a support
is to be used. The Adjustable Length Section also
provides relief for liner thermal expansion. The
Adjustable Length Section should be positioned
directly under the Vent Pipe Section that is being
supported.
Adjustable Length Sections
Adjustable Length sections of Type B Gas Vent are
available to allow for installation where fixed-length
sections do not produce the desired dimensions.
The
Adjustable Length
sections use a clamping
method consisting of a screw and tabs to draw the
outer wall tightly around the mating section Type B
Gas Vent.
Adjustable Length Sections may also be used to
compensate for linear thermal expansion between
two fixed points in the vent system. An example
of this is shown in Figure 5. In these examples,
the fastening devices are not used. This allows for
expansion between two fixed supports or between
a fixed support and the appliance. Note that the
fastening means should be left loose only if the Vent
and the Adjustable Length Sections are installed
vertically. I f the Adjustable Length Sections are
used in a position other than vertical, such as
between offsets, the fastening means should be
used.
Finally, when joining an Adjustable Length Section
to another section of Type B Gas Vent, make sure
that there is a minimum overlap of one inch.
Assembly of the vent
• Appliances to be vented should be placed as
close as possible to the point where the vent is to
run vertically up through the building.
• Install the support assembly (RSA). A support
assembly is recommended for all installations for
the following reasons.