The top of the line Okna is the 800 Series Enviro-Star. This version of the picture window has double pane glass and heavy duty foam filled frame. Open your home to the outside and keep the cold out and the cool in. These custom made windows are available in many shapes and configurations to build a unique look or replace an existing window.
- 3000% Better Air Infiltration protection
- Wide selection of glass, grids and shapes
- Superior craftsmanship
- Full 3¼" Depth Welded Mainframe
- Beveled colonial exterior features
- Available in standard and custom exterior colors
- Maintenance free, for years of long lasting performance.
- Heatseal® warm edge spacer system for excellent thermal efficiency and drastic reduction in the possibility of condensation on the inside of the window.
- Available in Replacement and New Construction applications.
| Energy Star | Comparison To | ||||||
| Glazing Option | U-Value | SHGC | VT | CR | Minimum* | Energy Star Minimum | |
| Dual Glazed | |||||||
| Clear Glass | 0.45 | 0.62 | 0.65 | 45 | 0.30 | Does not qualify | |
| Industry | Comparison To | ||||||
| Our Windows | Minimum | Industry Minimum | |||||
| AAMA Rating | R 75 | R 15 | |||||
| Air Infiltration cfm/ft2 | 0.01 | 0.3 | 3000% | Better | |||
| Water Penetration mph | 66 | 33 | 100% | Better | |||
| Structural Integrity mph | 210 | 94 | 123% | Better | |||
