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Fire detection and fire alarm devices for dwellings - Specification for heat alarms Ingestion-build-141043 BS EN 806-4:2010 Specifications forBS 5446 2: 2003 specifies requirements and type test methods for heat alarms. It is applicable to heat alarms intended solely for permanent installation on ceilings or walls of dwellings, and to heat alarms suitable for use in leisure accommodation vehicles (LAVs).