Daily/Weekly Cleaning
External Cleaning: Use a vacuum cleaner or soft brush to remove dust from the FFU casing, air inlet, and air outlet surfaces to avoid affecting airflow or causing secondary pollution.
Check Operating Status: Observe for abnormal noise, vibration, or control panel alarms to ensure the fan and air speed are normal.
Filter System Cleaning and Replacement
Pre-filter
Check dust accumulation monthly;
If the pressure difference exceeds 1.5 times the initial value or the filter is visibly dirty, it is recommended to clean or replace it.
High-Efficiency Filter (HEPA/ULPA)
Check every 6 months. If the filter becomes black, airflow is significantly reduced, or efficiency declines, it should be completely replaced and cannot be cleaned;
Replacement is recommended to be performed by professionals or the manufacturer to ensure sealing and cleanliness standards.
Deep Cleaning (Every 3–6 Months)
Fan and Motor Cleaning
Turn off the power, disassemble and inspect, and use compressed air or a soft brush to remove dust from the impeller and motor;
Avoid excessive force to prevent damage to blades or bearings.
Electrical Connection Check: Clean the inside of the control box with a clean cloth or compressed air to ensure wiring is secure.
Casing and Seal Check: Clean internal air ducts, inspect whether the sealing strips are aged or damaged, and replace if necessary.