We will assume a 10 ft ceiling for our home, so total volume is 1000 x 10 or 10,000 cu. ft.
We also assume standard air exchange rate of 1 (source: http://www.daviddarling.info/encyclopedia/A/AE_air_change.html).
Since 10000 cu ft of air per hour must be moved, the CFM value is 10,000 cu ft/hr * 1hr/60 min or 167 CFM.
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