| 摘要 |
<p>A cavity closure for an opening in a building wall at which a window or door is to be inserted, comprising two U-shaped plastics extrusions (10, 10A) which can be interengaged together by means of fittings (12, 14, 16) to form a rectangular box-section member optionally of differing longer dimensions, so as to provide for the closure of cavities of three differing cavity widths according to the way in which the two elements are interengaged and the orientation in which the box-section is located in the cavity.</p> |
