Installation Instructions

7
AmeriVent Round and Oval Gas Vent
Installation Instructions
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 linear thermal expansion. The Adjustable
Length Section should be positioned directly under
the Vent Pipe Section that is being supported.
E. Vent Pipe Hanger and Support Bracket
Assembly
The Vent Pipe Hanger (VPH) (sizes 3-inch through
7-inch) and the Support Bracket Assembly (SBA) for
8-inch through 12-inch Type B Gas Vent are used to
provide lateral and some vertical support for sections of
Vent, as well as the correct clearance to combustible
materials. They also provide support and resupport for
offsets and horizontal runs.
Adjustable Length Sections
Adjustable Length Sections (12A and 18A) of Type B Gas Vent
are available to allow for installation where fixed-length sections
do not produce the desired dimensions. Sizes 3-inch through
8-inch use a single sheet metal screw, which should be
screwed into the mating section of Type B Gas Vent. Sizes
9-inch and above use two sheet metal screws equally spaced
around the mating section. Oval lengths use a clamping
method consisting of a screw and tabs to draw the outer wall
tightly around the mating section of 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. Examples of this are
shown in Figures 9 and 14. 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. If 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 two inches.
Firestopping
All Type B Gas Vent passing through floors, ceilings or
within vertical stud walls must be firestopped at floors or
ceilings. The Firestop must effectively close the opening
between the outer wall of the Vent Pipe and the hole cut
in the structure. In attics, the Firestop should be placed
on top of the framed ceiling opening to prevent insulation
and debris from coming into contact with the Vent Pipe.
NOTE: The Firestop Support Plate Assembly (FS, FSP
and EGS), the Support Plate, or Vent Collar
functions as a Firestop at the location where it
is installed.
Wall Thimble
The Wall Thimble (WT) is available to use where a
Type B Gas Vent passes through a vertical wall. The
Wall Thimble will provide for the proper clearance to
combustible material as the vent passes through the
wall, and will also act as a firestop for the vent.
ROUND
SUPPORT
PLATE
ADJUSTABLE
LENGTH
SECTION
Figure 14
ROUND
SUPPORT
PLATE
ADJUSTABLE
LENGTH
SECTION
ROUND
SUPPORT
PLATE
ADJUSTABLE
LENGTH
SECTION
30 FEET
MAXIMUM
30 FEET
MAXIMUM
APPLIANCE
DRAFT HOOD