Greenheck IGX Installation, Operation And Maintenance Manual page 12

Venting Instructions:
Concentric Venting
Concentric venting allows both the vent pipe and combustion air pipe to pass through one hole in the exterior
of a building. This can be accomplished by horizontal venting through an exterior wall or vertical venting
through the roof. A vent kit is required for either method of venting.
The concentric venting adapter is not designed for installations
on the exterior of buildings. Refer to the following diagrams
and instructions for proper installation instructions.
Installing the Concentric Venting Adapter
1. Determine the location of the Concentric Venting
Adapter (CVA) based on the method of venting to
be used (horizontal or vertical) and any clearances
that must be maintained (follow all codes
referenced in these instructions). Field supplied
mounting brackets are used to mount the CVA to
the wall or roof. It can be mounted flush to the wall
or it can be offset.
2. Determine the length of the mounting brackets and
fabricate from corrosion resistant material. Using
corrosion resistant screws, fasten the mounting
brackets to the CVA.
3. Determine the length of the vent pipe that must be
attached to the vent outlet on the concentric side of
the box. Make sure to add the thickness of the wall
or roof and the length of the mounting brackets.
Attach the proper length of pipe to the CVA using
three corrosion resistant sheet metal screws and
seal this joint using metallic tape, silastic, or caulk
Furnace
Size
100 - 150
200 - 400
**WARNING**
Non-Concentric
Side Vent Connections
Flue Air
Outlet Inlet
4 inches 4 inches
6 inches 6 inches
All measurements shown are diameters.
suitable for temperatures up to 350 degrees F. If
using metallic tape, wrap the tape around the pipe
two full turns.
4. Determine the length of the combustion air pipe
that must be attached to the combustion air intake
on the concentric side of the CVA. Cut the pipe
length making sure to add the thickness of the wall
or roof and the length of the mounting brackets.
Slide the combustion air pipe over the vent pipe
and attach the proper length of pipe to the CVA
using three corrosion resistance sheet metal
screws.
5. Place the entire CVA assembly (with piping and
support bracket attached) through the hole in the
wall or roof and verify that all distances and pipe
lengths requirements as specified in these
instructions are net. Attach this assembly to the
wall or roof using appropriate fasteners.
Concentric Side
Vent Connections
Flue
Outlet
4 inches
6 inches
12
Air
Inlet
6 inches
8 inches
Table 2