The retention period for the daily maintenance records of the air supply ceiling ( laminar flow ceiling ) depends mainly on industry regulations, product/project lifecycle, and the risk level of the clean area. There is no uniform “one-size-fits-all” figure across the country, but there are clear compliance guidelines in mainstream industries such as pharmaceuticals (GMP), medical devices, electronics, and food.
1. Pharmaceutical Industry (GMP): The strictest and most explicit
Bottom line requirement: At least keep for 1 year after the expiration of the product
Daily maintenance records (pressure difference, air velocity, cleaning, filter replacement, leak detection):
At least 5 years (industry standard, default standard for audits)
Sterile drugs, high-risk products (A/B class areas):
Suggested to keep ≥ 10 years (or until the product is withdrawn)
Key records (efficiency filter leak detection, replacement, verification):
Long-term preservation (entire equipment lifecycle)
2. Medical Device Industry (GMP / Medical Device Production Specifications)
Maintenance records for purification systems and air supply ceilings:
At least 5 years
Involving sterile, implantable:
Suggested ≥ 5 years, or 3 years after product launch
3. Electronics Semiconductor / Precision Manufacturing (ISO 14644)
Daily maintenance, particle monitoring, filter replacement records:
At least 3 years
Key process areas (such as 100-level / 10-level):
Suggested ≥ 5 years (for quality traceability, failure analysis)
4. Food / Cosmetics / HACCP
Clean area environment, purification equipment maintenance records:
At least 2 years
Export / high-risk categories:
Suggested ≥ 3–5 years
5. Hospitals / Biosafety Laboratories (BSL)
Clean operating rooms, ICU, biosafety cabinets / laminar flow ceilings:
Maintenance records ≥ 5 years
Infection control, infectious disease-related areas:
Suggested ≥ 10 years
6. You can directly apply the “safety standard” (audit-proof)
Regardless of the industry, it is recommended to uniformly implement:
Daily maintenance records (daily / weekly / monthly): At least 5 years
Key records (filter replacement, leak detection, verification, fault handling):
At least the equipment’s service life + 3 years
Electronic records: Permanent backup (cloud + local), non-modifiable, traceable
7. Why 5 years? (Compliance logic)
GMP / Drug Administration Bureau audit cycle: Usually 3–5 years once for traceability
Equipment lifecycle: Air supply ceiling / high-efficiency filter lifespan 3–8 years
Quality disputes / complaint traceability period: Generally 2–5 years in China
Industry best practice: 5 years is the global cleanroom industry’s common bottom line
8. Summary in one sentence (on-site / audit response)
Air supply ceiling maintenance records: At least 5 years for ordinary areas;
Pharmaceutical sterile / high-risk areas at least 10 years or 1 year after product expiration;
Key verification / replacement records are recommended to be kept until the equipment is scrapped.