Originally Posted by deerslayer
I'm sry, the referral "squirel cage" is what I call the blower fan which sits directly on top of the furnace and is open on one side so u can see the fan blades. This duct mounts on top of the blower fan and goes into the attic. The door on the front of the furnace which encloses the furnace has wire mesh in it and I think it gets the combustion air from here and enters the blower fan. I can't figure out if the pipe going to the attic is a "fume vent". The fumes and heat rising from the pilot when the furnace hasn't kicked on has to go somewhere. I'm just wondering if I need to extend this pipe thru the roof or will it just vent the fumes out thru the gable vents at the ends of the roof. I'm concerned if this is a fire hazard.
A greater danger would be that carbon monoxide ( CO ) would be vented into the attic!
All furnaces need ventilation and if yours is vented into the attic space, it would be a major problem.
CO is heavier than the air we breathe so it would seep down into the living quarters. WITH FATAL RESULTS!
The nature of your query leads me to believe that you are unfamiliar with the operating principals of combustion furnaces.
I would advise you to have a qualified furnace technician come in, check out your furnace and explain how yours works!