Greenheck IGX Installation, Operation And Maintenance Manual page 11

Venting Instructions:
Standard Indoor Units
Furnace
Size
100 - 150
200 - 400
Standard Vertical Venting
A = 12 inch minimum
A1 = 12 inch minimum, but should
size according to expected
snow depth.
Standard Indoor Venting
Flue
Outlet
4 inch
6 inch
All measurements shown are diameters.
Exhaust Vent
Building Roof
Terminal
Air Inlet
11
Table 1
A1
A