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This post is in answer to Tinchus2009 who asked whether or not my comments regrading 60/40 airflow was backed by any tests. They were using an airflow meter. while the openings in the two ports are substantially different leading one to question how this could be true. The answer is in how the airflow is picked up down stream of the fan. Note the scupper inside the Nozzle that picks up a disproportional amount of the air in relationship to the small port. That along with the friction with the overboard pipe causes the airflow to divide 40/60 percent. I played around with the scupper surface area until I got the desired airflow from each port.