How long will a HEPA filter last?
A HEPA filter can last three to five years or more in a standard cleanroom environment. Life of the HEPA also depends on ambient conditions and maintenance of the prefilters. Since airflow capacity decreases and static pressure increases over time, HEPA filters actually become more efficient as the filter loads. The filter should be changed once it has reached its capacity. For example, if a HEPA unit is set to for 90 ft/min (0.45 m/sec) on the setting, but is only achieving 70 ft/min (0.35 m/sec) on , then the HEPA filter should be changed.
