Perf Grille Installation Details

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11 Surface mounted perforated grille with countersunk screw holes	12 Flush mounted perforated grille with routed opening & countersunk screw holes
13 Removable perforated grille with loose angle frame	14 Flush mounted perforated grille with loose angle frame
15 Perforated grille with welded stiffener angles for additional support	16 Perforated grille with welded stiffener bars for additional support
17 Perforated grille with welded angles for concealed fastening	18 Perforated grille installed with wood moulding
19 Perforated grille fastened with ball catches