
Option B. Drop Ceiling Installation Using Screws (Cont’d) Option C. Back Box or Surface Mount Raceway Installation Drop Ceiling Mounting to Octagon Back Box Installed Flush to Drop Ceiling GLS-SIM Cresnet® GLS-ODT-C-500/1000/2000 Up to Three in Parallel The supplied masks mount in the sensor front cover. The half mask is supplied pre-mounted to demonstrate the mounting method. The perforated mask has twelve 30. removable segments that allow you to mask particular areas to prevent undesireable tr