Installation Of Concentric Venting - LG GEN2 Series Installation And Operation Manual

Installation of Concentric Venting

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 horizontal venting, the combustion air pipe must
terminate with the combustion 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.
NOTE
Vent piping is supplied by others and not supplied by
manufacturer.
CVA-4
4-inch Concentric
Venting Adapter
Combustion Air Connection
Concentric Side
Combustion Air Connection
Non-Concentric Side
Top View
CVA-6
6-inch Concentric
Venting Adapter
Exhaust Connection
Concentric Side
CVA
Exhaust Connection
Non-Concentric Side
Concentric Venting – Horizontal
Refer to the diagram below for venting on horizontal
concentric systems. 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).
A = 12 inch minimum
B = 12 inch minimum
Pitch vent pipe
downward
from furnace
¼ inch per foot
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.
Non-Concentric Side Vent
Connection Diameter
Furnace Size Exhaust Combustion Air
(MBH) (inches) (inches)
75-175 4
200-400 6
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.
Determine Venting Location
Determine the location of the concentric venting adapter
(CVA) based on any clearances that must be maintained
(follow all codes applicable).
Attach Mounting Brackets
Attach field-supplied, corrosion-resistant, mounting
brackets to the CVA using corrosion-resistant sheet
metal screws.
Exterior
Wall
B
Mounting
Bracket
A
EXHAUST
Exhaust
COMBUSTION AIR
Vent
Termina
l
Mounting
Combustion Air
Bracket
Inlet Guard
Concentric Side Vent
Connection Diameter
Exhaust Combustion Air
(inches) (inches)
4 4 6
6 6 8
Horizontal Concentric Venting
Vent Minimum Maximum
Length (feet) (feet)
Horizontal 5 70