EN 54-24:2008 Loudspeaker for voice alarm systems for fire detection and fire alarm systems for buildings Ceiling loudspeaker 6 W, 12 W, 24 W and accessories LC4-UC06E, LC4-UC12E, LC4-UC24E, LC4-CBB, LC4-MFD Type A 2014.01 | V1.31 | Installation Note Bosch Security Systems B.V.