Fenestration Performance: 5
glass only center to skylight glass only center
ASHRAE Chapter 15 fenestration U-factors (W/m²·K) for windows, skylights, curtain walls, and doors by glazing configuration and frame type. Covers single through quadruple glazing with air, argon, and krypton fill, low-e coatings at various emissivities, and all major frame materials. Source: ASHRAE Handbook Fundamentals 2021 Tables 4 and 6.
| glazing id | frame type | gap fill | gap mm (mm) | glazing category | glazing type | num panes (dimensionless) | u factor Wm2K (W/(m2·K)) |
|---|---|---|---|---|---|---|---|
| 5 | glass only center | air | 13 | Double Glazing | 13 mm airspace | 2 | 2.73 |
| 5 | glass only edge | air | 13 | Double Glazing | 13 mm airspace | 2 | 3.36 |
| 5 | operable alum no break | air | 13 | Double Glazing | 13 mm airspace | 2 | 4.3 |
| 5 | operable alum thermal break | air | 13 | Double Glazing | 13 mm airspace | 2 | 3.31 |
| 5 | operable insul fiberglass vinyl | air | 13 | Double Glazing | 13 mm airspace | 2 | 2.58 |
| 5 | operable reinf vinyl alum clad | air | 13 | Double Glazing | 13 mm airspace | 2 | 2.96 |
| 5 | operable wood vinyl | air | 13 | Double Glazing | 13 mm airspace | 2 | 2.86 |
| 5 | skylight alum no break | air | 13 | Double Glazing | 13 mm airspace | 2 | 6.17 |
| 5 | skylight alum thermal break | air | 13 | Double Glazing | 13 mm airspace | 2 | 5.41 |
| 5 | skylight glass only center | air | 13 | Double Glazing | 13 mm airspace | 2 | 3.24 |
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