We are glad to release our new security ceiling speaker ENC-806H, which is compliant with EN54-24 standard. It is a 6" speaker with dual paper cone. The SPL is as high as 93 dB, but the frequency response range is still within the limit by EN54-24 standard. The transformer is specially designed to meet the impedance requirement, with 6W/3W/COM tappings. Connected with a ceramic terminal and thermal fuse, this speaker manages to work without failure in case of fire. For safety reason, the metal back can is designed with a hook to connect to real ceiling, so that it will not fall off in case of fire to cause any injury. The fully sealed back can guarantees the back can to pass any demanding tests, such as SO2, damp heat, IP test, etc. ENC-806H is a good choice for fire security system.