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Fortress Windows
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Heavy-duty series aluminum bi fold door features:
| Door Type | Aluminum Patio / Balcony / Accordion Door |
| Frame Material | Aluminum alloy 6063-T5 |
| Profile Thickness | 2.0mm - 3.0mm options |
| Glass Type | Standard 5mm+12Air+5mm / Laminated / Low-E |
| Hardware | Chinese Top Brand / German Brand (ROTO, SIEGENIA) |
| Finish | Powder coating, Anodized, Wood grain, Fluorine carbon |











