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Mounting Instructions Mounting Instructions For PC5921, PC5921EXT and PC5921EXT/R For PC5921, PC5921EXT and PC5921EXT/R Directions: Directions: 1 Locate the desired placement of the unit. 1 Locate the desired placement of the unit. 2 Place the backplate against the wall and mark the 2 Place the backplate against the wall and mark the desired screw locations.