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