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Higher performance, affordable costZenith Series ZR-6 / 625

Alpen Zenith Series ZR-6 / 625 windows and doors (formerly the 525-S) are the newest addition to our high performance fiberglass frame lineup. By incorporating advanced technologies and enhanced design options into our best-selling ZR-5 / 525 Series windows, the ZR-6 offers even higher performance in an affordable package.  With full-frame R-values up to R-6.7 and a full catalogue of custom-design options, the Zenith Series ZR-6 / 625 offers outstanding value for residential and commercial buildings as well as retrofit and new construction.

Benefits of the Alpen Zenith Series ZR-6:


  • NFRC Certified thermal performance up to R-6.7
  • Exceed Energy Star® standards
  • AAMA Gold Labeled to Commercial Window (CW) performance
  • Superior air and water infiltration resistance
  • Glazing options for solar control and passive heat gain.
  • Advanced triple-pane, suspended-film glazing technology stabilizes interior glass surface temperature to create comfortable indoor living spaces year-round.
  • 99%+ UV blockage protects interior finishes
  • Custom built to fit your budget and design
  • Center-of-glass R-8


Click here to download the Alpen Zenith Series ZR-6 / 625 window and door Data Sheet.