I. Scheduling Reference for Replacement Periods (Only for time reference, differential pressure / leak detection priority)
Daily operation for 8 to 12 hours, clean and low-dust environment, regular maintenance of initial / medium efficiency filters
High-efficiency recommended period: 2 to 3 years
24-hour continuous operation in a regular clean workshop
High-efficiency recommended period: 1.5 to 2 years
High foot traffic, slight dust generation, pre-filter frequently exceeds replacement period
High-efficiency recommended period: 1 to 1.5 years
II. Hard Replacement Criteria (More important than the age, any of the following immediately requires replacement)
The operating differential pressure reaches twice the initial pressure;
PAO/DOP integrity leak detection fails, and re-sealing still leaks;
The working face wind speed continuously remains below 0.36m/s, and the fan and pre-filter faults are excluded;
Visible dust blowing from the outlet and continuous excessive dust suspension particles in the workshop.
III. Supplementary Explanation
Age is only a reference for preventive replacement. If it reaches the period but the differential pressure, wind speed, and leak detection are all qualified, it can be temporarily extended and the inspection frequency can be increased;
If it is not at the age but the differential pressure rapidly rises or the leak detection fails, it must be replaced in advance.