Probably with funnel system with a larger opening (funnel) will need a more powerful fan...JUST LIKE hoods or fume cabinet systems (face opening vs fan cfm) .....
Also flex tubing is not your friend, it causes turbulence in air flow which also causes static pressure (resistance to air flow) which reduces efficiency of a already anemic fan....
Unfortunately there is not any comprehensive study of how to build a system like this with all the proper flow numbers in relationship to duct size and fan capacities....
About all the has been proven is in some cases, is the builder of system has said "it works well for me".... This is not proper design criteria to build a system around....
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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