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INSTALLATION
Venting Instructions for Concentric Vent
Options
The concentric vent concept allows for the vent pipe and the
combustion air pipe to pass through one hole in an
EXTERIOR wall or roof. The concentric vent kits offered are
horizontal or vertical. Venting with 2 pipes; a combustion air
pipe and flue product vent pipe remains an option, primarily
for replacement heaters where two holes through the exterior
of a building already exist.
When utilizing the concentric vent option, you have already
pre-determined whether the unit heater will be horizontal vent
or vertical vent and have received the appropriate kit. At this
time, you need to verify that you have all the components
required for the venting option chosen. The components for
each kit are as follows:
Horizontal Concentric Vent Kit:
•
concentric adapter assembly
•
specially designed vent termination cap
•
specially designed inlet air guard
Vertical Concentric Vent Kit:
•
concentric adapter assembly
•
standard Briedert Type L or Gary Steel 1092 vent
termination cap
•
specially designed inlet terminal
Although the first installation you will make will be the
concentric adapter assembly, you should now "read ahead"
the instructions for the type of venting option you've already
chosen - i.e. horizontal concentric, vertical concentric, 2 pipe
horizontal or 2 pipe vertical. These instructions can be found
on pages 5, 6,or 7 of these installation instructions. After
reading your specific instructions, come back to "Installing the
Concentric Vent Adapter Box" section and begin.
Installing the Concentric Vent Adapter Box
CAUTION
The concentric vent adapter box must be installed inside of
the structure or building. Do not install this box on the
exterior of a building or structure.
1. Determine the location of the box. Refer to the instructions
in the following sections for the method of venting to be
used (vertical or horizontal). Maintain all clearances as
listed in these instructions.
2. This box can be mounted flush to the wall or roof, or the
box can be offset from the wall or roof by using field
supplied brackets. When mounting the box, consider
serviceability and access to the vent and combustion air
pipes.
3. If the box is to be mounted using field supplied brackets,
these brackets must be strong enough to rigidly secure
the box to the wall or roof, and should be made from
corrosion resistant material. After determining the length
of the field supplied brackets, attach them to the sides of
the box using several corrosion resistant sheet metal
screws. See figure 3 for typical installation and brackets.
Adapter Box Dimensions
A
B
Heater Sizes
1
3
130-225
8
/
"
11
/
"
4
4
Heater Sizes
1
10
/
"
16"
2
280-340
Concentric Side
C
Exhaust
Combustion
4"
4"
6"
4"
6"
8"
Figure 3
Adapter Box Assembly with Typical Field Supplied Mounting
Brackets
A
4. Determine the appropriate length of vent pipe that must be
attached to the vent outlet (the concentric side) of the box.
Refer to the following sections for the minimum length of
vent pipe to be used for the method of venting (vertical or
horizontal). Make sure to add the length of the field
supplied brackets if used, and the thickness of the wall or
roof.
5. Cut the vent pipe to the proper length and attach it to the
vent outlet of the concentric vent adapter box using at
least 3 corrosion resistant sheet metal screws. Seal this
joint using metallic tape suitable for temperatures up to
350° F. Wrap the tape two full turns around the vent pipe.
See figure 4.
Figure 4
Adapter Box Assembly with Vent Outlet Pipe Attached
6. Determine the length of the combustion air pipe to extend
through the wall. Refer to the following sections for the
minimum length of combustion air pipe to be used for the
method of venting being used, vertical or horizontal. Cut
the pipe to the proper length.
7. Slide the combustion air pipe over the vent pipe. Attach
the combustion air pipe to the adapter box using at least 3
non corrosive sheet metal screws. See figure 5.
Figure 5
Adapter Box Assembly with Combustion Air
Pipe Attached
Heater Parts from ACF Greenhouses
C
B
5
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