防火/防烟门组件用电控保持开启系统|沙特标准|SASO-EN-14637
SASO-EN-14637
Building hardware – Electrically controlled hold-open systems for fire/smoke door assemblies – Requirements, test methods, application and maintenance
建筑五金.防火/防烟门组件用电控保持开启系统.要求,试验方法,应用和维护