Greenheck IG / IGX (464104 IOM) (Pre-2009) - Manual (Page 15)

15
Exterior Wall
B
A
EXHAUST
COMBUSTION AIR
Pitch vent pipe downward from
furnace 1 ⁄
4
inches per foot
C
Field Supplied
Support Brackets
A = 12 inch minimum
B = 24 inch minimum
C = 12 inch minimum
Exhaust Vent
Terminal
Combustion Air
Inlet Terminal
Installation - Two Pipe Venting (Horizontal)
NOTE!
All vent piping is FIELD SUPPLIED by others.
NOTE!
Maintain at least 12 inches of clearance between
the exhaust pipe termination and the exterior
surface of the exterior wall.
NOTE!
The combustion air pipe must be a minimum of
12 inches from the exhaust pipe and 24 inches
from the exterior surface of the outside wall.
NOTE!
Optional venting kit includes two vent terminals.
Installation
NOTE!
A minimum of 1 inch and a maximum of 48 inch of building wall thickness is required for separated
combustion vent pipe.
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 and the maximum vent
length is 50 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