The main structure of the air supply ceiling ( laminar flow air supply ceiling ) typically has a lifespan of 15–20 years, and the core filter components need to be replaced every 1–2 years; daily maintenance mainly involves pressure difference monitoring, filter management, and inspection of seals and structure, ensuring cleanliness and stable airflow.
I. Service Life (Standard Operating Conditions)
1. Main Structure (static pressure box, frame, equalizing plate)
Design life: 15–20 years (high-quality hot-dip galvanized / stainless steel material)
Influencing factors:
Material: 304/316 stainless steel > hot-dip galvanized steel > ordinary steel
Environment: Humidity, corrosive gases, high dust can shorten the lifespan
Maintenance: Regular cleaning, anti-corrosion, and sealing maintenance can extend the lifespan
2. Core Filter Components (filters)
Primary efficiency (G4): 3–6 months replacement / cleaning
Intermediate efficiency (F8): 6–12 months replacement
High efficiency / ultra-high efficiency (H13–U15): 1–2 years replacement (or when the final resistance reaches twice the initial resistance)
3. Seals and Wearable Parts
Sealant strips / silicone: 2–3 years replacement
Equalizing membrane (PTFE): 5–8 years (with a temperature resistance of 121°C, sterilizable)
II. Daily Maintenance (Hierarchical Execution)
1. Daily / Shift (Basic Inspection)
Visual inspection: No abnormal noise, vibration, uneven air supply, dust accumulation on the panel
Instrument monitoring: Record filter pressure difference, supply air speed, and static pressure box pressure
Surface cleaning: Use dust-free cloth + neutral cleaner to wipe the air supply panel and frame
2. Weekly (Seals and Connections)
Check sealant strips: Check for aging, cracking, or detachment, and repair in time
Check fasteners: Check if the pressure strips and screws are loose, and tighten (torque 8–10N·m)
Check equalizing membrane: Check for damage, blockage, or deformation
3. Monthly (Deep Inspection)
Filter: Record pressure difference, if the increase ≥ 30% prepare for replacement
Static pressure box: Internal cleaning (negative pressure suction), check for corrosion, dust accumulation, insulation layer
Fan / FFU: Check operating current, noise, vibration, and grease for bearings
4. Quarterly (Performance Verification)
Wind speed uniformity test: Multiple point measurement, deviation ≤ ±10%
Leakage detection: PAO aerosol leak detection, leakage rate ≤ 0.01%
Electrical and control: Line, sensor, alarm function verification
5. Annually (Comprehensive Maintenance)
Filter integrity test, replacement (according to cleanliness level)
Structural anti-corrosion, comprehensive replacement of seals
Third-party cleanliness and air flow organization testing and report issuance
Establish maintenance file: Record pressure difference, wind speed, replacement, leak detection data
III. Key Points for Filter Replacement
Trigger conditions for replacement (satisfy any one of them)
Time: High efficiency 1–2 years, primary efficiency 3–6 months, intermediate efficiency 6–12 months
Pressure difference: Final resistance reaches twice the initial resistance (e.g., H13 initial resistance 250Pa → 500Pa)
Performance: Leak detection leakage, cleanliness not up to standard, wind speed decline
Replacement process (anti-pollution)
Shut down, isolate the area, wear clean clothes
Old filter sealed packaging is taken out, 75% alcohol is used to clean the static pressure box
New filter is inspected for leaks before installation, evenly and symmetrically tightened
After replacement, re-inspect for leaks, measure wind speed, and verify cleanliness
IV. Common Problems and Prevention
Filter short lifespan: Front-end primary / intermediate efficiency failure → shorten the replacement cycle of the pre-filter
Leakage: Aging seals, improper installation → regular leak detection, standard tightening
Unstable airflow: Equalizing membrane blockage, dust accumulation in the static pressure box → regular cleaning, check equalizing membrane
Corrosion: High humidity / corrosive environment → select stainless steel, regular anti-corrosion
V. Summary Table of Lifespan and Maintenance

VI. Management Suggestions
Establish a full life cycle archive to record installation, testing, maintenance, and data replacement
Develop differentiated maintenance plans based on cleanliness levels (100-level / 1000-level / 10,000-level)
Entrust a third party to conduct performance certifications annually to ensure compliance and stability