Trellidor Security Grilles Trellidor is a retractable security grille located within a securely anchored frame. The working parts of the grille (or sash) are constructed to a trellis design consisting of vertical uprights and horizontal ‘flights’, crossing a minimum of 3 verticals allowing the grille to expand and contract uniformly. The grille locks into a strike jamb on either or both sides and is hung from the top frame by a system of rollers. It glides on a bottom track and stacks to either or both sides.

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