Based on the working conditions, pressure difference standards, and industry scenarios, provide the regular service life for each scenario. Also, distinguish between theoretical duration and actual usage duration, and mark the special requirements for explosion-proof areas:
I. General determination criteria
The initial resistance is set at 120-180 Pa, and the termination replacement resistance is 300-350 Pa. Explosion-proof areas should prioritize pressure difference, while the time is only for reference.
II. Service life by scenario
Low dust and clean explosion-proof areas (pharmaceutical sterile areas, precision optics, ordinary explosion-proof laboratories)
With little environmental dust, oil mist, and solvents, continuous operation for 24 hours: 5-8 months; intermittent operation can reach 8-12 months.
Medium pollution explosion-proof areas (electronic explosion-proof workshops, some fine chemical industries)
A small amount of organic solvents and slight dust: regular 3-5 months.
High pollution explosion-proof areas (lithium battery production, electrolyte/solvent workshops, cosmetics filling, oil mist/flammable dust conditions)
Pollutants are prone to adhere and penetrate the filter material, and the resistance increases rapidly: 2-3 months, and in some heavy oil-soiled environments, it may even be less than 2 months.
III. Additional influencing factors
Installing primary / pre-filter screens: The overall service life can be extended by 30% to 50%, which is the most effective way to extend it.
Long-term operation at excessive wind speed, blocked air intake, and large dust in the workshop: The lifespan is directly shortened by more than half.
After the filter material adsorbs electrolyte, alcohol, and flammable dust, even if it is not the time or pressure difference, it is recommended to replace it in advance (explosion-proof safety is prioritized).
IV. Summary and overview
| Usage scenario | Normal lifespan |
| Low dust explosion-proof clean area | 5 ~ 12 months |
| Moderate pollution explosion-proof area |
3 ~ 5 months |
| Lithium battery / High solvent content / High dust area | 2 ~ 3 months |
Reminder: The explosion-proof FFU must not operate with excessive resistance or any malfunction. When the pressure difference reaches the threshold, it must be replaced immediately. Do not use it for an extended period under any circumstances.
