Perforated Grille Installation Details Click on the desired image to obtain a printable document of installation details     11. Surface mounted perforated grille with countersunk screw holes 16. Perforated grille with welded stiffener bars for additional support     12. Flush mounted perforated grille with routed opening & countersunk screw holes 17. Perforated grille with welded angles for concealed fastening     13. Removable perforated grille with loose angle frame 18. Perforated grille installed with wood moulding     14. Flush mounted perforated grille with loose angle frame 19. Perforated grille fastened with ball catches     15. Perforated grille with welded stiffener angles for additional support       Click HERE for Linear Bar Grille Installation Details