FAAST-LT smoke detection system by suction. The equipment includes 1 high sensitivity laser detector, a flow sensor by ultrasound and protected electronics. FAASTLT includes alarm and prealarm levels which can be set up between 9 sensitivity levels. A graphic pendulum shaped bar with 9 air flow levels makes sure the air flows according to the requirements of EN54-20. The information can be easyly and quickly read in the user interface or with USB connection using the PipeIQ LT programme.