Rule 1097. Section C303.1.3 of the code is amended to read as follows:
Exception:
U-factors shall be determined by an accredited, independent laboratory, and labeled and certified by the manufacturer.
Products lacking a labeled U-factor shall be assigned a default U-factor from Table C303.1.3(1) or C303.1.3(2). The solar heat gain coefficient (SHGC) and visible transmittance (VT) of glazed fenestration products (windows, glazed doors, and skylights) shall be determined in accordance with NFRC 200 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled SHGC or VT shall be assigned a default SHGC or VT from table C303.1.3(3).
Mich. Admin. Code R. 408.31097