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NWA = GWA - (DA + GA)

Where:

 

 NWA        = Net area of wall, square feet (ft²)
 GWA        = Gross wall area, square feet (ft²)
 DA        = Non-glass door area, square feet (ft²)
 GA        = Non-skylight glass area (including glass doors), square feet (ft²)

 

Ref: Manual J 8 - Page 3-1