Thanks for your responses guys.
OK here is what I have done.
All of the dampers are wide open to the room.
The 4 inch stuff is a bummer, but its an old hose and thats what is in the walls.
Replaceing the runs are literally impossible because they are in interier walls and Ceilings , not attic space.
This is at the end of the plenum (about 35 feet) then goed up about 9 feet then over about 12 feet to a wall register in the 2nd floor, it just might be too far???
I have not insulated the plenum yet?? Does that help much????
I tried a blower but I'm not getting great results....
Any more ideas.
thanks a lot,
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