24 S i g n a l i n g D e v i c e s Overview MB Series Motor Driven Bells ar e specially designed for fr e alarm applications. The gongs ar e made fr om select alloy steel chosen to give the loud, r esonant tones necessary in fr e alarm and life safety systems. T wo sizes of gongs ar e available to help over come dif fer ent ambient noise levels. MB bells ar e the “under -dome” type and use heavy duty mechanisms. The bell’ s base and gong ar e fnished with a durable “Fir e Red” baking enamel. They mount on any standar d North-American squar e electrical box. Field wiring connections ar e made to colour -coded leads. Installation and Mounting Standar d Featur es • Mounts to a standar d 4” squar e electrical box • Wir e lead design • High quality micr omotor • Loud r esonant tones • Low curr ent draw • “Fir e Red” fnish Or dering Information Cat. No. Description MB6-24 6" (150mm) Fir e Alarm Bell, Red Finish 92dB at 10ft, 45 mA MB10-24 10" (250mm) Fir e Alarm Bell, Red Finish 97dB at 10ft, 45 mA MBFP-2 Flush mounting plate, Red Finish WBB-1 W eatherpr oof mounting box 10" Bells 3 1/8" (80mm) 6" Bells 2 19/32 (66mm) Mounting holes 3 3/8" squar e (86mm squar e) Holes ar e located to mount to a standar d 4" squar e outlet box MB Series Bells M B 1 0 2" wide 1104 single gang outlet box (supplied by others) 4" octagon box (supplied by others 4" squar e outlet box (supplied by others) MBFP-2 mounting plate r equir ed for ?ush installation Gong Plunger Hex bolt