This virtually indestructible cover (slotted for horn/strobe unit alarms) is designed to stop vandalism and accidental damage for surface mounted units. Molded of clear, thick, UV-stabilized polycarbonate material, backed by a lifetime guarantee against breakage in normal use. Slots in the STI 1210D allow the horn to be heard. Unit comes with a spacer with knockouts for mounting over exposed conduit. Or, selcet flush mount model, without back box. STI-1210D FEATURES •UL Listed to U.S. and Canadian safety standards. •MEA Approved. •Helps prevent accidental and intentional damage or vandalism. •Easy access for service. •UV-stabilized. •Spacer easily mounts over exposed conduit. •Polycarbonate rated -40ºF to 120ºF (-40ºC to 49ºC). •Lifetime guarantee against breakage in normal use. Light Derating Factor •47% - Generic Values •40% - ADT Security - ADTG1-V Series •47% - Amseco - SL24W-153075 •47% - Amseco Colored Lenses - SL24W-153075 - A,B,G, or R •47% - Amseco Colored Lenses - SL24C-3075110 - A,B,G, or R •47% - Amseco Colored Lenses - CSL24W - A,B,G, or R •47% - Amseco Colored Lenses - CSL24C - A,B,G, or R •43% - EST / Edwards - 2440S Series •43% - EST / Edwards - 202 Series •40% - EST / Edwards - G1-V Series •40% - EST / Edwards - G1-HV Series •40% - EST / Edwards - G1-HOV Series •40% - EST / Edwards - EG1-V Series •40% - EST / Edwards - EG1-HV Series •40% - EST / Edwards - EG1-HOV Series •43% - Honeywell - XLS202 Series •40% - Honeywell - XLSG1-V Series •40% - Honeywell - XLSG1-HV Series •40% - Honeywell - XLSG1-HOV Series •47% - Mircom - FS-240 •43% - Mircom - MS Series •40% - Mircom - MG1-V Series •40% - Mircom - MG1-HV Series •40% - Mircom - MG1-HOV Series •43% - Mirtone - MG1-V Series •47% - Potter Electric - AS24-153075R •47% - Potter Electric - AS24-153075W •43% - Siemens - 202 Series •40% - Siemens - G1-V Series •47% - System Sensor - SS24110ADA •53% - System Sensor - P2, PC2, P4, PC4, SX, SC •40% - Ziton Pty LTD - ZG1-V Series Sound Loss •6.2 dBA - Generic Values