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Fortress Windows
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| Performance Parameters | |||
|---|---|---|---|
| Test Item | Unit | Results | Level |
| Air tightness (Positive) | m³/(m·h) | 1.4 | Level 6 |
| Air tightness (Negative) | m³/(m·h) | 1.3 | Level 6 |
| Water tightness | Pa | 350 | Level 4 |
| Wind resistance | kPa | 2.68 | Level 4 |
| Thermal insulation | W/(m²·K) | 2.2 | Level 6 |