HEPA filters capture airborne particles. Filter efficiency and the integrity of the installed assembly are different issues.
Check the installation
Leaks may occur through media, frames or seals. A filter certificate does not replace an appropriate installed leak test.
Keep useful records
- Filter pressure drop and airflow or velocity.
- Visible frame, seal and media condition.
- Leak-test results and maintenance history.
Review when conditions change
Assess abnormal readings, relevant interventions and scheduled checks. Pressure drop alone does not prove integrity. Room particle counting is not a substitute for filter leak testing.