You need to make sure you won't cause any structural problems with the home,
and you must maintain the same size duct all the way, with as few turns as
possible.

"RobertM" wrote in message
...
The heating contractor wants run a duct up from the cellar through the
living room floor and then turn 90 degrees to go through the wall to the
adjacent room that is on a slab. He says he'll box it in, but this will
leave an obstruction 8 inches out into the living room floor. Any reason
I can't remove a concrete block and come up through the sill plate and
run the duct up inside the wall? Any reason the contractor won't do it?

Bob