Umm... Though Michale Barley does us a box setup, properly in scientific, education and research or manufacturing facilities it is a "fume cabinet"
Larger pics would have been better to see what you are working towards...
Technically 1 and 3 are the same and 2 and 4 are the same.... Its all about size and air flow.... Any will work, its all about how meticulous in your design and execution of hood project....
You can make 2 & 4 into a 1 & 3 by just putting hood against back wall and adding sides....
Bottom line is what ventilation would work best for your work style....
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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