NPU Airflow Calculator

Our NPU Airflow Calculator is designed to provide guidance on the airflow performance of the NPU required to operate safely in your asbestos enclosure. Along with calculating the volume (m³) within your asbestos enclosure, this calculation can also account for number of air changes required, ducting length and number of 90 degree turns in the ducting system. 

Please note that this airflow calculator should be used as a guide only, and in-situ UK guidance should be consulted when conducting any airflow study.