Trick flow

rumblefish360 said
Really? Um, LOL, OK.

300 cfm through a 1x2 port is less volume than a 300 cfm port at 2x4. That is twice the volume at the same cfm.:poke::realcrazy::rolleyes:

Actually, 'cfm' is a measure of volume. 300 cubic feet per minute of airflow is a set amount of volume in a set amount of time.
The airflow speed to get 300 cfm through a 1x2 port (2 square inches of area) would have to be much greater than the airflow speed to get the same amount of volume through a 2x4 port (8 square inches of area).