Minimum 8% of floor area Minimum 4% of floor area Allowance to borrow L & V Minimum 50% of common wall open Minimum 10% of interior room area Minimum 25 square feet Minimum 3 square feet and Half openable <5 ACH requires whole house mechanical per M1507.3 Minimum 10' from contaminant sources Not directed onto walkways Corrosion resistant screens, louvers, grilles Min.1英尺室,然后在顶部的每个楼层开关 @; @ Bottom如果地下室在同一批次上向街道,公共巷子,院子或法院开放(请参见例外)> 40%的开放/筛选和7'天花板高度,能够维持68岁的所有者占据SFD
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