I am also building a new one. Currently use a bathroom fan in a plastic bin. Works great, but want to upgrade. I am going to use 2 or 3 230 something cfm axial fans. I don't want to give exact details, but if you research all of the availalble lure building info out there I am sure you will be able to find them That is how I did it and now have 12 fans on hand to experiment with. They are out there real cheap if you do some looking around.
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