Elmo PTC-100S Instruction Manual page 12

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