Certified Window

Pella Impervia Direct Set

Pella Corporation Blue Path Certified (Valid) NFRC Product # PEL-N-257-00329-00001

Overview

  • U-Value, Whole Window

    0.15 BTU/hr·ft²·°F 0.87 W/m²K

  • U-Value, Center of glass (U-COG)

    0.13 BTU/hr·ft²·°F 0.76 W/m²K

  • SHGC-COG

    0.331

  • Operation Type

    Fixed

  • Frame Material

    Fiberglass

  • IGU Panes

    Triple

  • Glazing Name

    LowE,Argon,3mm triple pane,PEL-N-257-00329-00001

  • Rec. Climate Zone(s)

    • 3C
    • 5C
    • 4C
    • 4B
    • 4A
    • 5A
    • 5B

IGU (Glazing) Information

  • Panes

    Triple

  • Gas Fill

    Argon

  • Spacer

    Cardinal Endur

Download

  • PDF Certificate

    Phius product certificates provide the component-level data needed for actual-size thermal performance calculations. Phius Blue Path and Orange Path certificates are functionally equivalent for use in Phius Project Certification.

Frame Information

Head Sill Left Jamb Right Jamb
Frame height 1.73 in 44 mm 1.73 in 44 mm 1.73 in 44 mm 1.73 in 44 mm
U-Frame 0.21 BTU/hr·ft²·°F 1.18 W/m²K 0.23 BTU/hr·ft²·°F 1.29 W/m²K 0.21 BTU/hr·ft²·°F 1.2 W/m²K 0.21 BTU/hr·ft²·°F 1.2 W/m²K
PSI-Spacer 0.011 BTU/hr·ft·°F 0.019 W/mK 0.012 BTU/hr·ft·°F 0.021 W/mK 0.011 BTU/hr·ft·°F 0.019 W/mK 0.011 BTU/hr·ft·°F 0.019 W/mK

A zero-carbon future starts right here with our locally tailored, globally applicable passive building standards.

© 2025 Phius All Rights Reserved.