I'm a little confused to what you're asking? (Also, you might get more responses in the safety room.)
Usually you start with your hood opening - let's say its 2' by 2' = 4 sq ft with side baffles (this by the way is a little small - but some people work in that area), the current accepted rule is 125 cfm per sq ft of face opening so you would need a minimum of a 500 cfm fan for that sq ft area.
Highly recommend you read through the safety section - there's tons and tons of info.
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