How often should the daily maintenance of a clean booth be carried out?

The daily maintenance frequency of clean booths needs to be flexibly adjusted based on factors such as usage scenarios, cleanliness levels, and production frequencies. The specific cycles for different maintenance items are as follows:
1. Daily maintenance is mandatory
Applicable items: Surface cleaning, initial inspection of cleanliness, observation of equipment operation status.
Specific content
Use a lint-free cloth to wipe off the floating dust on the ceiling, four walls, floor, and the surface of equipment, with a focus on cleaning the stains in the operation area.
Check whether the fan is operating normally (listen to the sound and look at the indicator lights), and confirm that there are no abnormalities in the air supply system.
If a differential pressure gauge or a dust particle counter is equipped, the cleanliness data of the day will be recorded to preliminarily determine whether it meets the standards.
Ii. Weekly regular maintenance
Applicable items: Cleaning/inspection of primary filters, safety inspection of electrical systems, and simple sealing tests.
Specific content
Remove the primary filter, rinse it with clean water or neutral detergent (if it is washable), dry it, and then reinstall it. If it is a disposable filter, observe the dust accumulation situation and replace it in advance if necessary.
Check whether the terminal blocks inside the distribution box are loose, whether the wires are aged, and test the sensitivity of the buttons on the control panel.
Visually inspect the joints of the clean booth for any signs of air leakage (such as whether paper scraps float when approaching), and preliminarily judge the sealing performance.
Iii. Monthly in-depth maintenance
Applicable items: Comprehensive inspection of fans and air supply systems, tightening of structural components, and temperature and humidity calibration (if necessary).
Specific content
Open the fan casing, clean the accumulated dust inside, check the tightness of the belt and the noise of the motor operation, and add lubricating oil if necessary.
Tighten the frame screws and connecting parts with a wrench to repair deformed aluminum alloy profiles or steel structure components.
If the clean booth has requirements for temperature and humidity, use calibrated instruments to check the sensor data. When the deviation exceeds ±2℃ or ±5%RH, the equipment needs to be debugged.
Iv. Quarterly/Semi-annual Special Maintenance
Applicable projects: Performance testing of high-efficiency filters, comprehensive sealing performance testing, and maintenance record review.
Specific content
Use a dust particle counter to detect the particle concentration in the clean booth (for ISO level 5, it is necessary to control the number of particles ≥0.5μm ≤3520 per m³). If the data exceeds the standard and the primary filter is in good condition, the high-efficiency filter may need to be replaced.
The overall sealing performance should be tested through smoke testing or a differential pressure gauge (the differential pressure should be maintained at 5-10Pa). For any air leakage, fill it with sealant or replace the rubber strip.
Summarize the maintenance records of the previous 3 to 6 months, analyze the frequency of filter replacement and the trend of equipment failure, and adjust the subsequent maintenance plan.
V. Annual System Maintenance
Applicable items: Mandatory replacement of high-efficiency filters (depending on the situation), insulation testing of electrical systems, and comprehensive verification of cleanliness grades.
Specific content
If the high-efficiency filter has been in use for 2 to 3 years, even if the test results do not exceed the standard, it is still recommended to forcibly replace it to avoid sudden failure. If the usage environment is poor (such as a high-dust scene), the replacement cycle can be shortened to 1-2 years.
Use an insulation resistance meter to measure the insulation resistance value of the electrical circuit (which should be ≥0.5MΩ) to eliminate the risk of leakage.
Entrust a third-party institution to conduct ISO grade certification tests on the clean booth to ensure that all indicators (such as particle concentration, air velocity, and illuminance) meet the design requirements.
Vi. Suggestions for Adjustments in Special Scenarios
In highly polluted environments (such as welding and grinding workshops), the cleaning frequency of the primary filter can be shortened to once every 3 days, and the replacement cycle of the high-efficiency filter can be advanced to 1.5 to 2 years.
Frequent start-stop scenarios (such as switching on and off more than twice a day): Increase the lubrication of the fan bearings once a week to prevent accelerated wear.
After long-term inactivity and restart: Before restarting, the fan should be run idle for 2 to 4 hours, and the cleanliness should be rechecked. If necessary, the primary filter should be replaced.
Key principle: The maintenance frequency should be centered on "ensuring that the cleanliness meets the standards". This can be achieved by establishing a maintenance ledger to record the time and effect of each operation, and gradually optimizing the cycle. If any abnormality in cleanliness is detected (such as a decline in product yield or excessive test data), the inspection frequency should be immediately increased and the cause investigated.