View our current listings of Phius-certified windows and doors with the link below:
Orange Path vs. Blue Path
You'll see Phius certificates in two colors: orange and blue. Phius certified windows are rated according to either the Phius Orange Path (based on EN standards) or the Phius Blue Path (based on NFRC standards). The text border at the top of each label notes the corresponding calculation standards. You may see some manufacturers have submitted products to both paths, and that's perfectly normal! Phius considers each path's certificates functionally equivalent for energy modeling purposes when submitting for Phius project certification. Blue Path certified products are also available in the NFRC Certified Product Directory linked below.NFRC Certified Product Directory (CPD)
General Info for Comparing Products
Window, door, and skylight certificates show detailed data used for energy modeling and provide performance summary information for comparison-shopping. Checkmarks appear on each certificate indicating the particular climate zones for which the window is recommended. Check marks (recommendations) are NOT required to use the window in that climate zone. These marks are merely suggestions or starting points for those less familiar with what their climate zone may demand from fenestration products. The (1) Product and Series Name and (2) Glazing Package Name/Information help name the certified product. You can compare windows by evaluating their (3) Whole-Window Installed U-value at Standard Size. The whole window U-value includes the effect of a nominal installation thermal bridge coefficient of 0.026 W/m.K (0.015 Btu/h.ft.F). Another comparison feature are the (4) Climate Zone Recommendations at standard modeled size. Finally, (5) Spacer Information and the (6) Psi-Opaque Grade add additional comparison points.
Data for Energy Models
The information here (outlined in red) is what you'll need to model a Phius certified window at actual size for your product. Software such as WUFI Passive will ask for this information in order to model it properly. Here you'll find the (A) Solar Heat Gain Coefficient, (B) U-Center-of-Glass value, (C) Frame Dimensions, (D) U-Frame values, and (E) the Psi-Spacer value which is NOT to be confused with the Psi-opaque value. The Psi-opaque value combines the frame and edge-of-glass heat loss into a single figure of merit and enables fair comparison of frames of different widths, and comparison of different frame-spacer combinations; it is not an input for energy models and is not a universally-recognized figure.
We currently have one panel system certified with more on the way!