A boiler firing 30 gal/hr No. 6 oil (Heavy oil) requires 18.5 % excess air for complete combustion.  Approximately, how many CFM of combustion air should be supplied ? Note: I don't understend what to do with the 18.5% excess air Note: I've asked this question twice before, but one gave "b)", and the other gave "c)" as the answer a) 450 CFM b) 750 CFM c) 900 CFM d) 1150 CFM

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