Concentric Venting Installation - LG AR-DR12-05A Installation And Operation Manual

Concentric venting allows the exhaust pipe and combustion air pipe
to pass through a single hole in the roof or wall of the building. A
concentric venting adapter (CVA) is required for concentric venting.
The concentric venting adapter is designed for indoor installations
and should never be installed on the exterior of the building.
The exhaust pipe must terminate with the vent terminal. For horizon-
tal venting, the combustion air pipe must terminate with the com-
bustion air guard. For vertical venting, the combustion air pipe must
terminate with the inlet terminal. Depending on what was ordered,
one of these vent terminals will be provided in the optional venting
kit along with the concentric venting adapter (CVA).
If venting vertically through the roof, refer to the vertical concentric
venting instructions. If venting horizontally through the wall, refer to
the horizontal concentric venting instructions.
Vent piping is supplied by others and not supplied by manufacturer.
Concentric Venting – Horizontal
Refer to the diagram below for venting on horizontal concentric sys-
tems. Maintain at least 12 inches from the combustion air inlet guard
to the exhaust vent terminal (Dim. B). To prevent water from running
into the combustion air pipe and to allow for easy installation of the
combustion air inlet guard, the combustion air pipe must terminate at
least 2 inches from the exterior surface of the outside wall (Dim. A).
Figure 38: Concentric Venting - Horizontal
INDIRECT GAS FIRED FURNACES
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Concentric Venting Installation

Figure 37: Concentric Venting Adapters
Vent Connection Diameter
Vent terminals must be used (one vent terminal and inlet guard
included with each furnace). Construct the vent system as shown in
the drawings and refer to the table for the correct vent connection
diameters.
Vent Length
Refer to table for minimum and maximum vent lengths. The total
equivalent vent length must include elbows. The equivalent length of
a 4 inch elbow is 6 feet and the equivalent length of a 6 inch elbow
is 10 feet.
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