Made for
energy.
The energy code sets a number. We show you which glass reaches it, with the NFRC certificate that proves it.
Whole-window NFRC values, certified. CPD numbers: VST-K-4-00221-00001 (window), VST-K-3-00262-00001 (terrace door). We only print values that carry a certificate number.
Four steps down. Same window.
The frame stays the same. The glass changes. Each step is a certified glass on a Vi6 casement, without grilles.
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Certified, or simulated?
A simulated U-factor is a calculation. A certified one has been through NFRC and carries a CPD number you can look up. Ask for the number. Every value on this page has one, and where a product is not certified yet, we say so.
| Best certified U, by product | U | NFRC CPD |
|---|---|---|
| Vi6 terrace door, in-swing | 0.16 | VST-K-3-00262-00001 |
| Vi6 casement | 0.17 | VST-K-4-00221-00001 |
| Vi6 fixed | 0.17 | VST-K-1-00173-00001 |
| Vi6 terrace door, out-swing | 0.17 | VST-K-6-00083-00001 |
| Vi6 hopper | 0.18 | VST-K-5-00086-00001 |
| Vi5 fixed | 0.18 | VST-K-8-00032-00001 |
| Sliding door | 0.19 | VST-K-12-00076-00002 |
| Vi5 terrace door, in-swing | 0.19 | VST-K-7-00032-00001 |
| Vi5 casement | 0.20 | VST-K-9-00032-00001 |
| Vi5 hopper | 0.21 | VST-K-13-00037-00001 |
One glass does both.
The acoustic triple with a warm-edge spacer is certified at U 0.18 and tested at OITC 40 — on the same window.
High Performance. Made for —
Have an energy model?
Send the target U-factor and SHGC with your plans. We match the glass to it.