| 摘要 |
A head joint grille (10) for installation in the outer panel of a cavity wall to allow ventilation of the cavity has a body through which extends a hole (13a,b,c), from one side to the other. The hole may provide a grip for a bricklayer's fingers, form a mortar anchorage and allow the bundling together of several grilles. Baffle plates (19a-f) may be incorporated within the body, and the body may be made up of two identical interconnecting parts(11a,11b). |
