NA6.2 Default U-factor
Equation NA6-1
UT= C1 + (C2 X Uc)
Where:
UT = U-factor Is the Total Performance of the fenestration including glass and frame
C1 = Coefficient selected from Table NA6-6
C2 = Coefficient selected from Table NA6-6
UC = Center of glass U-factor calculated in accordance with NFRC 100 Section 4.5.3.1 (http://www.nfrc.org/software.aspx)
Table NA6-6 – U-factor Coefficients
Product Type | Frame Type | C 1 | C 2 |
Site-Built Vertical Fenestration | Metal | 0.311 | 0.872 |
Site-Built Vertical Fenestration | Metal Thermal Break | 0.202 | 0.867 |
Site-Built Vertical Fenestration | Non-Metal | 0.202 | 0.867 |
Skylights with a Curb | Metal | 0.711 | 1.065 |
Skylights with a Curb | Metal Thermal Break | 0.437 | 1.229 |
Skylights with a Curb | Non-Metal | 0.437 | 1.229 |
Skylights with no Curb (Deck Mounted) | Metal | 0. 310 | 0. 878 |
Skylights with no Curb (Deck Mounted) | Metal Thermal Break | 0. 195 | 0. 882 |
Skylights with no Curb (Deck Mounted) | Non-Metal | 0.310 | 0.878 |