Based on the operating conditions and industry standard practices, the recommended replacement periods are provided for different scenarios, along with the basis for the determination (the time is only for reference; priority should be given to the pressure difference / wind speed):
1. Standard Replacement Period
Continuous operation for 24 hours
Conventional clean area: 1.5 – 2 years
Areas with slight dust generation / large flow of people: 1 – 1.5 years
Daily intermittent operation for 8 – 12 hours
Conventional clean area: 2 – 3 years
Aseptic / low-dust areas: up to 3 years +
2. Supplementary Comparison (Combined with Pre-filter)
For initial / medium-efficiency filters, maintenance according to the upper limit period and environmental cleanliness: Execute according to the upper limit period
If the pre-filter exceeds the service life or there is a lot of dust on site: Follow the lower limit period or replace earlier
3. Important Reminder
The time is only a reference and should not be the sole basis
When the pressure difference reaches twice the initial value, the wind speed does not meet the standard, or the leak detection of PAO/DOP is不合格， regardless of whether it is the replacement period or not， replace immediately.
High-efficiency filters cannot be blown or washed， and if they are ineffective， replace them directly with new ones.