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U-factor.
An area-weighted average shall be permitted to satisfy the U-factor requirements for each fenestration product category listed in Table C402.3. Individual fenestration products from different fenestration product categories listed in Table C402.3 shall not be combined in calculating area-weighted average U-factor.

Related Code Sections

C402.3.4 [CE] Commercial Energy Efficiency, Area-Weighted
U-factor. An area-weighted average shall be permitted to satisfy the U-factor requirements for each fenestration product category listed in Table ...