Standard Glass Package Thermal Performance
For the North-Central, South-Central, and Southern Climate ENERGY STAR Zones
Cambridge – Performance Data
| Glazing | Window Style | Window Size | Total Unit U-Value1 | Visible Light Transmittance 2 | SHGC 5 | Condensation Resistance 6 | ENERGY STAR CERTIFICATION | |||||
| Grids | No Grids | Grids | No Grids | YES | NO | |||||||
| Low-e glass, low-conductance spacer and argon gas fill. | Double-Hung | <= 48" x 72" | 0.29 | 0.41 | 0.46 | 0.18 | 0.20 | 58 | NO GRIDS | GRIDS | ||
| Single-Hung | <= 40" x 72" | 0.29 | 0.41 | 0.46 | 0.18 | 0.20 | 57 | Y | _ | |||
| Picture | ANY SIZE | 0.26 | 0.45 | 0.51 | 0.20 | 0.22 | 61 | Y | _ | |||
| Geometric | ANY SIZE | 0.25 | 0.48 | 0.54 | 0.21 | 0.23 | 63 | Y | _ | |||
| Casement | <= 36" x 72" | 0.28 | 0.38 | 0.42 | 0.17 | 0.18 | 60 | Y | _ | |||
| Casement Picture | <= 72" x 72" | 0.26 | 0.44 | 0.50 | 0.19 | 0.21 | 60 | Y | _ | |||
| Awning | <= 60" x 36" | 0.29 | 0.38 | 0.42 | 0.17 | 0.18 | 56 | Y | _ | |||
| Slider | <= 96" x 60" | 0.28 | 0.39 | 0.44 | 0.17 | 0.19 | 61 | Y | _ | |||
| Vinyl Sill Patio Door | <= 192" x 96" | 0.31 | 0.39 | 0.45 | 0.17 | 0.20 | 56 | _ | N | |||
| Transom /Sidelites | ANY SIZE | 0.50 | 0.50 | 0.56 | 0.22 | 0.24 | 63 | Y | _ | |||
Northern Zone Glass Package Thermal Performance
For the Northern Climate ENERGY STAR Zone
| Glazing | Window Style | Size | Total Unit U-Value1 | Visible Light Transmittance 2 | SHGC 5 | Condensation Resistance 6 | ENERGY STAR CERTIFICATION | |||||
| Grids | No Grids | Grids | No Grids | YES | NO | |||||||
| Low-e glass, low-conductance spacer and argon gas fill. | Double-Hung | <= 48" x 72" | 0.30 | 0.48 | 0.54 | 0.38 | 0.43 | 57 | NO GRIDS | GRIDS | ||
| Single-Hung | <= 40" x 72" | 0.30 | 0.48 | 0.54 | 0.38 | 0.42 | 57 | NO GRIDS | GRIDS | |||
| Picture | ANY SIZE | 0.27 | 0.53 | 0.59 | 0.41 | 0.45 | 61 | Y | _ | |||
| Geometric | ANY SIZE | 0.26 | 0.57 | 0.63 | 0.45 | 0.49 | 63 | Y | _ | |||
| Casement | <= 36" x 72" | 0.29 | 0.44 | 0.49 | 0.35 | 0.38 | 59 | NO GRIDS | GRIDS | |||
| Casement Picture | <= 72" x 72" | 0.27 | 0.49 | 0.51 | 0.41 | 0.46 | 60 | Y | _ | |||
| Awning | <= 60" x 36" | 0.29 | 0.44 | 0.49 | 0.35 | 0.39 | 56 | NO GRIDS | GRIDS | |||
| Slider | <= 96" x 60" | 0.29 | 0.46 | 0.52 | 0.36 | 0.40 | 61 | NO GRIDS | GRIDS | |||
| Vinyl Sill Patio Door | <= 192" x 96" | 0.32 | 0.45 | 0.52 | 0.35 | 0.40 | 56 | _ | N | |||
| Transom /Sidelites | ANY SIZE | 0.27 | 0.59 | 0.66 | 0.46 | 0.51 | 62 | Y | _ | |||
Air, Water and Structural Performance
| Window Style | Individual Unit Size | Mulled Unit Size | ***Test Method | Total Unit Air Infiltration @25MPH | Water (PSF) | Structural Rating | Overall Grade Rating | |
| Double-Hung | 48"x 72" | _ | AAMA/WDMA/CSA 101/I.S.2/A440-05 | 0.11 CFM | 9.82 | 60 | R60 | |
| Single-Hung | 48"x 72" | _ | AAMA/WDMA/CSA 101/I.S.2/A440-05 | 0.09 CFM | 9.19 | 60 | R36 | |
| Double-Hung Oriel | 36"x 72" | _ | AAMA/WDMA/CSA 101/I.S.2/A440-05 | 0.06 CFM | 7.52 | 50 | R50 | |
| Double-Hung Reverse Oriel | 48"x 72" | _ | AAMA/WDMA/CSA 101/I.S.2/A440-05 | 0.11 CFM | 7.52 | 50 | R50 | |
| Single-Hung Oriel | 36"x 72" | _ | AAMA/WDMA/CSA 101/I.S.2/A440-05 | 0.05 CFM | 7.52 | 50 | R50 | |
| Single-Hung Reverse Oriel | 36"x 72" | _ | AAMA/WDMA/CSA 101/I.S.2/A440-05 | 0.03 CFM | 6.06 | 40 | R40 | |
| Twin Double-Hung | 52" x 80" | 104" x 80" | AAMA/WDMA/CSA 101/I.S.2/A440-05 | 0.11 CFM | 7.52 | 40 | R40 | |
| Triple Double-Hung | 52"x 80" | 157" x 80" | AAMA/WDMA/CSA 101/I.S.2/A440-05 | 0.11 CFM | 7.52 | 40 | R40 | |
| Picture | 96"x 48" | _ | AAMA/WDMA/CSA 101/I.S.2/A440-05 | 0.01 CFM | 12.12 | 70 | R70 | |
| 2-Lite Slider | 96"x 48" | _ | AAMA/WDMA/CSA 101/I.S.2/A440-05 | 0.10 CFM | 9.20 | 50 | R50 | |
| 3-Lite Slider 1/4-1/2-1/4 | 138"x 60" | _ | AAMA/WDMA/CSA 101/I.S.2/A440-05 | 0.08 CFM | 8.36 | 25 | R25 | |
| 3-Lite Slider 1/3-1/3-1/3 | 138"x 60" | _ | AAMA/WDMA/CSA 101/I.S.2/A440-05 | 0.11 CFM | 8.36 | 30 | R30 |
Sound Transmission
| Window Style | Unit Size | IG Unit | Glazing | STC | OITC | |
| Double-Hung | 47-1/4"x 59" | 15/16" | 1/8" annealed, 1/2" spacer, 1/8" annealed | 27 | 22 | |
| Single-Hung | 47-1/4" x 59" | 15/16" | 1/8" annealed, 1/2" spacer, 1/8" annealed | 27 | 22 | |
| Picture | 47-1/4"x 59" | 15/16" | 1/8" annealed, 1/2" spacer, 1/8" annealed | 31 | 25 | |
| 2-Lite Slider | 59"x 47-1/4" | 15/16" | 1/8" annealed, 1/2" spacer, 1/8" annealed | 27 | 22 | |
| STC rating was calculated in accordance with ASTM E 413. | ||||||
Cambridge Thermal Testing Footnotes
1 Windows tested per NFRC 100. Data applies to double-pane insulated glass units using a double-strength glass with a 1/2″ airspace.
Data applies to: *Cambridge double-pane insulated glass units using double-strength glass with 11/16″ air space.
2 Tested using GED’s Intercept® ULTRA low-conductance warm-edge spacer system. Calculations provided by Lawrence Berkeley Laboratory Window 7.4 and Optics5 software based on 15/16″ IGU for Cambridge windows.
3 Daylight Transmittance measures the performance of the glass only.
4 International Standards Organization Damage Weighted Transmission Rating (Tdw-ISO) calculations performed by Lawrence Berkeley Laboratory 7.4 Windows software and is weighted using recommended International Commission on Illumination (CIE) standards.
5 Solar Heat Gain Coefficient (SHGC) tested in accordance with NFRC 200. This value varies by style, glazing system and grids.
6 Condensation Resistance is tested in accordance with NFRC 500.
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