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Unit A=1,214 Sq Ft Equation 15.1=S4 CFM. <br /> • <br /> ,Unit B=1,244 Sq Ft Equation 15.1=27.44 CFM <br /> This is below the minimum so it defaults to 30 CFM. <br /> According to table M1505.4.3 at 1,214 sq ft with 2 bedrooms the CFM requirement would be 40 CFM <br /> Installing 120 CFM fan running at 20 minutes per hour would equal the required ventilation for the space. <br /> 1 <br />