N1101.10.3 (R303.1.3) Fenestration Product Rating
U-factors of fenestration products such as windows, doors and skylights shall be determined in accordance with NFRC 100.
Exception: Where required, garage door U-factors shall be determined in accordance with either NFRC 100 or ANSI/DASMA 105.
U-factors shall be determined by an accredited, independent laboratory, and labeled and certified by the manufacturer.
Products lacking such a labeled U-factor shall be assigned a default U-factor from Table N1101.10.3(1) or N1101.10.3(2). The solar heat gain coefficient (SHGC) and visible transmittance (VT) of glazed fenestration products such as 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 N1101.10.3(3).
TABLE N1101.10.3(1) [R303.1.3(1)]
| FRAME TYPE | WINDOW AND GLASS DOOR | SKYLIGHT | ||
| Single pane | Double pane | Single | Double | |
| Metal | 1.20 | 0.80 | 2.00 | 1.30 |
| Metal with Thermal Break | 1.10 | 0.65 | 1.90 | 1.10 |
| Nonmetal or Metal Clad | 0.95 | 0.55 | 1.75 | 1.05 |
| Glazed Block | 0.60 | |||
TABLE N1101.10.3(2) [R303.1.3(2)]
DEFAULT OPAQUE DOOR U-FACTORS
| DOOR TYPE | OPAQUE U-FACTOR |
| Uninsulated Metal | 1.20 |
| Insulated Metal | 0.60 |
| Wood | 0.50 |
| Insulated, nonmetal edge, not exceeding 45% glazing, any glazing double pane | 0.35 |
TABLE N1101.10.3(3) [R303.1.3(3)]
DEFAULT GLAZED FENESTRATION SHGC AND VT
| SINGLE GLAZED | DOUBLE GLAZED | GLAZED BLOCK | |||
| Clear | Tinted | Clear | Tinted | ||
| SHGC | 0.8 | 0.7 | 0.7 | 0.6 | 0.6 |
| VT | 0.6 | 0.3 | 0.6 | 0.3 | 0.6 |