The second floor is a slightly different story. I was expecting a more powerful flow there. (tho it's certainly much better than it was with the old unit) I wonder if anything could be done to improve this. What was a little unusual, tho, is that the master bedroom had a stronger flow than the 2nd bedroom. The vents are essentially back to back, sharing the same wall.
I crawled up to the attic to inspect the vents and discovered the reason for this. The tube comes up to the attic where it hits a Y connector. The master bedroom's tube comes off this in a straight line while the 2nd bedroom's goes up and around. This upwards slant also feeds the shaft to the office and two bathrooms, all of which have lessor air flow.
I wonder what can be done to improve this. First thought is to completely redo the layout up there so all the venting is flat on the floor. My next thoght is to insert a fan in the tubing to help propell the air along. Do they make such a thing? I'd image the airflow would spin the fan which would force the air thru faster thus getting a stronger flow to these rooms thus cooling off the upstairs faster.
Any other suggestions?