Greenheck IG / IGX (464104 IOM) (Pre-2009) - Manual (Page 17)

17
C
D
D
B
A
A = 12 inch minimum, but should size
according to expected snow depth.
B = 24 inch minimum
C = 12 inch minimum
D = 12 inch minimum
EXHAUST
COMBUSTION AIR
Tee with drip leg and
clean-out cap.
Combustion Air
Inlet Terminal
Exhaust Vent
Terminal
Installation - Two Pipe Venting (Vertical)
NOTE!
The combustion air pipe must terminate at least
12 inches above the roof. This clearance may
need to be increased to accommodate for snow
accumulation.
NOTE!
The exhaust must terminate at least 12 inches
above and 12 inches horizontally from the
combustion air inlet.
NOTE!
All vent piping is FIELD SUPPLIED by others.
NOTE!
The optional vent kit includes two terminals.
Installation
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 10 feet and 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.
Vent Connection Diameter
Furnace Size Exhaust Combustion
(MBH) (Inches) Air (Inches)
75 - 175 4 4
200 - 400 6 6