So far any fan listed here seems inadequate to me.... And thing labeled as duct booster fan and only lists its CFM at 210 in "free air" is not acceptable.... The 500 CFM rating in "booster fan mode" means nothing as you are not using it as a booster fan anyway.....
http://www.homedepot.com/h_d1/N-5yc1...atalogId=10053
There is not any proof that a funnel system will operate proper with less CFM than a conventional hood...
I would not consider anything under 500 cfm for a funnel system....
You have to remember with funnel system air draw (capture) is less efficient than any hood system... The suction or draw decreases dramatically for every couple of inched (in a radial pattern) as you get further away form funnel opening....
Dale
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