Greenheck IG / IGX (464104 IOM) (Pre-2009) - Manual (Page 9)

9
Standard Horizontal Venting
A = 12 in. minimum
A
Pitch vent pipe
downward from
furnace 1 ⁄
4
inches per foot
Exhaust Vent
Terminal
EXHAUST
Exterior Wall
Air Inlet
Step 1 Select Vent Pipe Size
Select the vent pipe size from the table to the right.
Use only the specified pipe size.
Step 2 Install Exhaust Vent Pipe
Install the vent pipe with minimum downward slope (from the unit) of 1 ⁄
4
inch per foot. Securely suspend the pipe
from overhead structures at points no greater than 3 feet apart. Attach the vent terminal to the end of the
exhaust pipe.
Installation - Standard Indoor Venting
NOTE!
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 units where chlorinated, halogenated, or acid vapors are present.
NOTE!
When units are installed in tightly sealed
buildings, provisions should be made to supply
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 BTU per hour of input rating.
IMPORTANT!
Vent terminals must be used. Construct the vent
system as shown in drawings and reference the
tables for the correct vent pipe diameters. 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.
Standard Vertical Venting
B
A = 12 inch minimum
B = 12 inch minimum,
but should size
according to
expected snow
depth.
EXHAUST
Exhaust Vent
Terminal
Air Inlet
Roof Line
A
Furnace Exhaust Pipe
Size (MBH) Diameter
75-175 4 inches
200-400 6 inches
Installation