Choice = Warm Edge Dual Heat Shield Argon Technology with foam filled frame.
- Exceptionally Low Air Infilitration Rating
- Dual Pane - Double Strength - Heat Shield Glass
- Heatseal® Spacer with Argon Fill
- Beautiful Beveled Foam Insulated Frame and Sash
- Full Interlock with Triple Weather-Stripping
- NFRC U-Factor: 0.25 Air Infiltration: 0.02 â€‹ Solar Heat Gain: 0.27