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