MEZ | H1/B2

MEZ H1/B2 siren is a high-tone mechanical siren, which is one of the most common mechanical siren found in Czechia. It has 9 ports, and can be found in two different roof-cover variants - single and multi-layer. It can be sometimes found without a covering, usually under a separate roofing. All of the options are usually made of sheet metal. The build of the motor and stator is slightly different to the MEZ H4/A2 version, which has a bulkier motor and rounded transition to the stator. Exceptions to the material are relatively uncommon.

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The MEZ siren, compared for example to the DS977, Fm Si 41 or KIRKE has a significantly higher tone of 435 Hz, sharing a very fast wind-up to full revolution (approx. 1 second) with the Fm Si 41. The siren runs on three-phase and single-phase power, and may be used solely as a fire protection (FP) unit, which is found to be common.

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In the Czech Republic, there are 208 sirens registered within the JSVV (Jednotý systém varování a vyrozumění - Unified warning and notification system), from which there are 187 sirens actively in use. (as of 17/6/2021)