Grille

As a closure for a building opening, an improved vertically movable grille operatively disposed for opening and closing movement in said building opening comprising, in combination, two vertically oriented hollow members each disposed along an opposite side of said building opening and each having a vertically oriented slot in facing relation to said building opening so as to provide vertical guideways for said grille, a grille body formed of horizontally oriented spaced apart rods interconnected by vertically oriented links in attached relation to adjacent pairs of said rods, each said link having a slot of a selected size therein, plural transparent plastic slats having operative horizontally oriented positions resulting from being projected through said slots of said links in horizontal alignment with each other, each said slat being of a transverse size such that the opposite ends thereof extend through said guideway slots into said hollow members, and crimps in the construction material of each of said slats at said opposite ends within said hollow members effective to modify the shape thereof so as to obviate sliding movement of said slat ends through said slots of those of said links adjacent said ends, whereby said crimped slat ends are only nominally vulnerable to tampering in said hollow members while being effective in maintaining said slats in position on said grille.