"John91" wrote in message
...
It's about my 40-yr old 2-storey house in midwest Canada. After taking off
part of basement ceiling, I found something weird with a heating duct. It
runs up from basement to main floor along an exterior wall (built into the
fiberglass insulation), and maybe further up to the second floor, and to
attic??? I'm sure no heating vent in the house uses this duct. I just
can't figure out where is goes. It sends hot air to attic to do heating?
possible for an old house?

please help solve the mystery. Thanks.



You said "to attic???" That's a question only you can answer. Have you gone
up in the attic to take a look?

Separate question: On the 2nd floor, where are the heat vents? Floor? Wall?
Ceiling?