Greenheck IGX Installation, Operation And Maintenance Manual page 16

Venting Instructions:
2-Pipe Horizontal
1. Construct the vent system as shown below. Looking
in the direction of airflow, the venting is on the right
side of unit.
2. The termination of horizontally vented systems must
extend 12 inches beyond the exterior surface of an
exterior wall.
Horizontal Venting
A = 24 inch minimum
B = 12 inch minimum
C = 12 inch minimum
Pitch vent pipe downward from
furnace .25 inches per foot
Separated Combustion 2-Pipe Venting Kit - Horizontal
Furnace Size 100 - 150 mbh
Kit contents: (2) 4 inch vent terminal (2) 6 inch vent terminal
All measurements shown are diameters.
The venting parts listed above are supplied by Greenheck.
All vent piping is FIELD SUPPLIED by others.
3. The combustion air pipe must be a minimum of 12
inches below the vent pipe and 24 inches from the
exterior wall.
4. Support the vent and combustion air pipe as shown
below.
A
B
EXHAUST
COMBUSTION AIR
200 - 400 mbh
16
Exterior Wall
Exhaust Vent
Terminal
C
Combustion Air
Inlet Terminal
Field Supplied
Support Brackets