Energy Code Ace - NA6.2 Default U-factor

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NA6.2 Default U-factor

Equation NA6-1

U_T= C₁ + (C₂ X U_c)

Where:

U_T = 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

U_C = 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

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