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All Windows Are NOT Created EqualZenith Series ZR-10

The only commercially available, NFRC-certified full frame 0.10 U-factor window in North America.

Finally, the R10 window has arrived.

Window manufacturers have been working for decades to develop a commercially viable, full-frame R10 window. Now, an industry leader has emerged with the only full frame certified R10 window on the market—Alpen High Performance Products.

Alpen’s Zenith Series ZR-10 / 1025 features include:

  • The ZR-10 / 1025 high profile fixed window certified to a 0.10 U-factor
  • Operable windows certified to 0.14 U-factor
  • Super-insulated energy efficient pultruded fiberglass frames
  • Double film, triple chamber insulated glass assemblies featuring four independent low-e surfaces
  • High-performance spacers and high-performance inert gas fill
  • 99.5 % UV protection
  • Extraordinary solar control performance
  • Proudly designed, developed and manufactured in the USA


Zenith Series ZR-10 NFRC Certification Label
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Download the ZR-10 / 1025 Data Sheet

For more information on the ZR-10 Fixed Window or Alpen’s complete line of Zenith Series ZR-10 / 1025 products call 800-882-4466 or contact us here.