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Building Envelope Fenestration <br />Vertical Fenestration <br />Maximum U-Factor <br />0.45 <br />Maximum SHGC <br />0.33 <br />Maximum air leakage rate for all fenestration except curtain <br />walls and storefront glazing <br />.20 cfm/ft2 <br />Maximum air leakage rate for curtain walls and storefront <br />.06 cfm/ft2 <br />-glazing <br />Sk li hts <br />Maximum U-Factor <br />0.50 <br />Maximum SHGC <br />0.40 <br />Maximum Air leakage rate <br />.20 cfm/ft2 <br />12. C403.2 System design. Mechanical systems shall be designed to comply with <br />Sections C403.2.1 through 403.2.3 C403.2.4. Where elements of a building's <br />mechanical systems are addressed in Sections C403 through C403.14, such <br />elements shall comply with the applicable provisions of those sections. <br />13. Section C403.2.4 Space heating equipment is hereby added as follows: <br />C403.2.4 Space heating equipment. Fossil -fuel warm air furnaces <br />appliances and electric resistance space heating equipment shall not <br />be permitted for space heating in new construction. <br />Exceptions: <br />1. Emergency backup. Where it is required by an applicable law or regulation <br />to provide space heating with an emergency power system or a standby <br />power system. <br />