CFM needed for a forge blower?

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Hi all, and a Merry Christmas!I am working on my forge design, and am looking at using an exhaust fan connected to a dimmer switch for my blower.  Home depot has a 50CFM model with good reviews (except for noise, which I don't care about), it is only $13.  Would 50 CFM be enough?  I could step up to 90 CFM or even 110 CFM, but that puts my cost up to $35 or $41 respectively.  How many CFMs do I need to get the heat I will need for a forge. and will more CFMs equate to faster heats? Thanks for any input.
Reply:50CFM looks plenty large. Take a look at these commercial forge blowers. Most are in the 25-50 CFM range and you would still need to choke down the airflow.http://www.piehtoolco.com/contents/en-us/d1172.html.No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
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