A professionally conducted load calculation is the foundation of an effective system.
Goodman furnace exhaust pipe size.
Traditional gas fired forced air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes or chimneys.
Goodman 96 afue gas furnace has 2 pipe direct vent to outdoors.
Also known as the induced draft fan this one has a fan that is located on the end of the pipe.
In contrast modern high efficiency condensing furnaces exhaust much cooler gasses and need only plastic pipe materials such as pvc cpvc or abs for their exhaust vents some high efficiency furnaces also include a plastic pipe for intake area and all types.
Sizing the equipment load requires the consideration of several factors.
Since the exhaust pipe is running on a sidewall the fan works together with the furnace.
Ceiling height construction window size and placement and dozens of other variables all need to be considered to properly size a heating and or cooling system.
When compared to the natural vent this one is more flexible although it is also costlier.