[QUOTE]Originally posted by tinner73
Originally posted by titan7
4. If two stories,what feeds the down stairs??
Just that 9" in the family room, Up in the attic they run three 6" flex lines to the other side of house in the attic and down the stairwell to the livingroom, dinning room, and kitchen. Bad design but this was what the original ductwork did.
i think this is your problem. if i understand right, the 6" ducts run across the attic AND then down the stairwell. i'm sorry to say but you have a horrible duct system in your house. it is by far the cheapest to install and the worst for airflow. if all your ducts were smooth insulated metal you would have better airflow.
Well better airflow minus the up to the 40% leakage you can have with those smooth insulated tin ducts....
But I will not argue the duct design and sizing seem inadequate.
thehumid1-------I live in NJ, a state where it's free to come in but you have to pay to leave!