| 摘要 |
The ventilation duct consists of a casing (1) with an inner lining of insulation panels. The panels are made from a mineral, e.g. glass or rock wool, and have their inner surfaces (2a) protected by layers of glass fabric, with their exposed edges (2b) covered by the same material. The insulation panels are held in place inside the duct by lengthwise Z-section elements (3), each of which is positioned to cover at least part of a panel's lengthwise edges and to overlap part of its flat inner surface. The Z-section elements can be in various configurations, e.g. with folded edges, and they can be cut and bent to follow bends in the ventilation duct. In addition, joints between the ends of insulation panels can be covered by T-section elements.
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