Standard Indoor Venting Installation - LG AR-DR12-05A Installation And Operation Manual

INDIRECT GAS FIRED FURNACES

Standard Indoor Venting Installation

Standard indoor venting uses one penetration through an exterior
wall or roof for venting the flue exhaust.
The combustion air is supplied from the air inside the building.
Units must not be installed in a potentially explosive, flammable, or
corrosive atmosphere. To prevent premature heat exchanger failure,
do not locate unit where chlorinated, halogenated or acid vapors are
present.
When units are installed in tightly sealed buildings, provisions should
be made to supply an adequate amount of infiltration air from the
outside. The rule of thumb is that an opening of one square inch
should be provided for every 1000 BTUs per hour of input rating.
Vent terminals must be used. Construct the vent system as shown in
the drawings. Reference the Vent Pipe Diameter table and Exhaust
Vent Pipe table for additional details.
Vent Pipe Diameter
Select the vent pipe diameter. Use
only the specified pipe diameter.
Installing Exhaust Vent Pipe
Install the vent pipe with a mini-
mum downward slope (from the
unit) of 1/4-inch per foot (horizontal venting only). Securely suspend
the pipe from overhead structures at points no greater than 3 feet
apart. The minimum vent length is 5 feet for horizontal and 10 feet
for vertical. The maximum vent length is 70 feet. 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.
Attach the vent terminal to the end of the exhaust pipe.
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Figure 35: Standard Indoor Venting - Horizontal
Figure 36: Standard Indoor Venting - Vertical