I have a new home with a Carrier Infinity 96 gas furnace and I'm concerned about improper airflow. For the supply, people tell me that on HIGH, it should be enough to really blow your hair noticeably -- mine doesn't out of any register. For the return, I did the "paper test" by placing a piece of paper over the return register - some have some suction but not enough to hold the paper fixed, some have NO suction whatsoever !! Are these tests enough to go back to my contractor with? What "rule of thumb" tests can I use to determine if I have adequate airflow in/out of my supply/return registers ?? ...something I can take to my HVAC contractor! Thanks!