Elmo PTC-100S Manuel D'Instructions

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Make 4 holes of  8mm (5/16 in.) to the
Ceiling Tile as shown.
70mm (2-3/4 in.)
102mm (4 in.)
54mm
(2-1/8 in.)
FRONT
BACK
CEILING TILE
(t 1/2 in.    1 in.)
t = thickness
MOUNTING HOLE
  8mm (5/16 in.), 4 LOCATIONS
(2) Making mounting holes to the Ceiling Tile