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Good morning. I am going to look at a job soon. Customer says that he is burning 407 mbtuh. He says that the boiler room is enclosed. There is a 5" pipe running from outside into the boiler room. The 5" pipe is the only sorce of outside air. The customer would like add a fan to the 5" pipe to ensure adequate combustion air. Is there a formula for determining what size fan etc to use? Obviously too small is no good and too big is no good. Again, I haven't seen the actual job yet.
Thanks in advance for the advice.