| 摘要 |
The set comprises first and second ventilation units 1, the first comprises a surface 6 with at least one formation 18 designed to engage with a co-operating formation on a surface of a second unit, in a direction perpendicular to the surfaces of the units. The formations preferably engage with a push- or interference-fit. The formations may comprise spacer elements such that a space is formed between the units into which adhesive may be applied. The bricks may be identical in design, and can stack on top of one another so that the ends 8, 9 are parallel or staggered relative to one another. Also claimed is a ventilation unit, a method of stacking a set of ventilation units and a method of installing a set of ventilation units. |
