What is/was this duct for?
I discovered this insulated duct above the dropped ceiling in the basement. It stops above the washer and dryer in the utility room where the furnace also is. It runs to the back of the house but there's drywall up there so I can't see any further. A full bathroom was added by the former owner below where this duct runs. As far as I can determine it is not in use for anything. I "think" it may have been hooked up to the exterior vent that the basement bathroom exhaust vent is now connected to? Any other thoughts?
The opening on the end is 3" and I believe the diameter of the insulated duct is also 3"
It's very clean inside as per the photo
The bathroom has another duct for its vent fan that exits the back of the house and runs parallel to this one along another floor joist about 2 feet away. I don't know the diameter of the bath vent duct.
The furnace has an insulated 4" fresh air vent duct running to it that goes out the side of the house.
The opening on the end is 3" and I believe the diameter of the insulated duct is also 3"
It's very clean inside as per the photo
The bathroom has another duct for its vent fan that exits the back of the house and runs parallel to this one along another floor joist about 2 feet away. I don't know the diameter of the bath vent duct.
The furnace has an insulated 4" fresh air vent duct running to it that goes out the side of the house.