Perhaps the most critical test, this verifies that HEPA and ULPA filters are properly installed and free of pinhole leaks or bypasses in the housing.
A designated leak is typically defined as anything exceeding 0.01% of the upstream concentration for standard HEPA filters. 2. Airflow Velocity and Volume Testing iso 146443pdf 2021
While ISO 14644-1 defines what "clean" means in terms of particle concentration, Part 3 describes how to measure it and other critical performance parameters. Its scope encompasses various testing methods for both unidirectional and non-unidirectional airflow systems. These tests are typically conducted across three occupancy states: Perhaps the most critical test, this verifies that
Added a method to assess the effectiveness of separating two areas (e.g., a workstation from a background room) using airflow. Perhaps the most critical test