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