Fusible Operating Units The operation of fusible operating units is provide when the fusible detector detects over 91C ( 172C, 105C, 124C ( + / -3% ) of heat, The units discharge the aerosol through chemical combustion of fire wall Brand: Fusible Operating Units Product Type: Product Features: Product Specification: Hub: mia_ brsinaga@ yahoo.com ph 085691398333./ 021-40911748.