Outdoor Installations
The venting system is designed for direct discharge of flue gases to the
outdoors.
Vent pipe diameter depends on furnace input rating. See Table below for
required pipe diameter for vent installation.
All vent piping is installer provided.
A coupling is installed on the induced draft fan for attachment of vent pipe.
Depending on orientation a drain hose may be attached to the ID fan.
Flue Products must be directed downward.
Table
– Outdoor Vent Pipe Sizing
For vent piping attached to a single induced draft fan
Input Rating (Btuh)
Input Rating (W)
Vent Pipe Dia.
90,000
– 135,000 26,376 – 39,564
3 in. (76 mm)
180,000
– 360,000 52,753 – 87,921
4 in. (102 mm)
