Air Sampling Devices (ASDs) are smoke detectors that actively take air samples from the monitored area and analyse them for the presence of smoke particles. They basically consist of a detection unit and the associated pipe system. The low pressure needed for air sampling is produced by a fan and airflow sensor technology ensures functionality by constantly monitoring the pipe system for breakages and obstructions. Thanks to their outstanding reliability, sensitivity and false alarm immunity, air sampling smoke detection systems have been the tried and tested system of choice in a wide variety of applications. Especially in areas with particular detection requirements and difficult environmental conditions, these systems, approved under EN 54-20, have shown impressive technological leadership. Honeywell has demonstrated this through a comprehensive range of project design options for all the new standard classes and set a whole new standard within the industry.