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Interpretation of Mandatory Requirements Based on National Standards

In the construction of laboratory animal facilities, final acceptance of conventional animal housing rooms is a critical milestone that determines whether a project can be officially put into operation. Whether for new construction or renovation projects, only strict, item-by-item verification in accordance with national standards can ensure that the facility environment meets the requirements for animal housing and experimental use.

Based on current Chinese national standards such as GB 14925-2010 Laboratory Animal Environment and Facilities and GB 50447-2008 Technical Code for Architectural Planning of Laboratory Animal Facilities, this article systematically summarizes the mandatory acceptance criteria and practical inspection checklist for conventional laboratory animal housing rooms.

1. Why Must Acceptance of Conventional Animal Housing Rooms Strictly Follow Standards?

Conventional animal housing rooms are mainly used for laboratory animals such as guinea pigs, rabbits, and dogs. Environmental control directly affects animal health, welfare, and the reliability of experimental data. According to acceptance practices from universities and research institutions, project completion acceptance is only the first step—actual operation requires comprehensive environmental testing by a qualified third-party inspection agency.

Key acceptance references include:

• GB 14925-2010 – Laboratory Animal Environment and Facilities
  Defines core parameters such as temperature, humidity, air change rate, pressure differential, and environmental control requirements.

• GB 50447-2008 – Technical Code for Architectural Planning of Laboratory Animal Facilities
  Specifies requirements for building layout, interior finishes, and engineering systems.

• Project contracts and design drawings
  The acceptance team must verify construction completion against contractual and design commitments item by item.

2. Acceptance Checklist for Conventional Animal Housing Rooms (By Category)

2.1 Engineering Documentation Review

Before on-site inspection, the acceptance team must confirm that all engineering documents are complete and compliant:

2.2 Architectural Finishes and Interior Construction

Interior finishes must meet the basic requirements of corrosion resistance, easy cleaning, and no dead corners:

• Walls and floors: Smooth, waterproof, acid- and alkali-resistant materials; internal and external corners should be rounded to facilitate cleaning and disinfection.

• Doors and windows: Good airtightness; must effectively prevent insect entry.

• Pipe penetrations: All wall and ceiling penetrations must be properly sealed to prevent cross-contamination.

2.3 HVAC, Ventilation, and Pressure Differential Control

Environmental control is the core function of conventional animal housing rooms.

Temperature and Humidity Control

• Temperature: Generally 18–29 °C, depending on animal species (refer to GB 14925).

• Relative humidity: 40%–70%.

• Acceptance method: Continuous operation monitoring to confirm system stability.

Air Change Rate and Cleanliness

• Air changes: 8–10 ACH for conventional animal rooms.

• Cleanliness: No mandatory cleanliness class, but cross-contamination must be prevented.

• Inspection focus: Fresh air intakes away from pollution sources; exhaust air effectively treated.

Pressure Differential Control

• Pressure relationships (positive or negative) between rooms and corridors should be determined based on animal species and biosafety requirements.

• Residual air volume pressure control is recommended to balance precise control and energy efficiency.

• Verification: Measure pressure differentials using micro-pressure gauges.

2.4 Equipment Installation and Operational Acceptance

All equipment must be tested individually to ensure proper operation:

2.5 Fire Protection and Safety Systems

Fire safety is a mandatory acceptance requirement and must be jointly inspected with the safety department:

• Fire exits unobstructed

• Fire extinguishers complete and within validity period

• Smoke detection and alarm systems functioning normally

• Emergency evacuation signage clearly visible

2.6 Third-Party Environmental Testing

Based on acceptance experience from institutions such as medical universities, third-party environmental testing is required after construction acceptance:

Key test items include:

• Temperature and humidity distribution: Continuous monitoring for ≥48 hours to verify uniformity.

• Pressure differential effectiveness: Simulated door opening/closing to test recovery capability.

• Air change rate measurement: Tracer gas or airflow velocity methods.

• Noise and illumination: Noise levels in animal areas should generally be ≤60 dB.

3. Common Acceptance Issues and Rectification Recommendations

Based on multiple project cases, the most common problems and solutions include:

Issue 1: Large temperature and humidity fluctuations

• Cause: Inadequate system commissioning or undersized HVAC equipment

• Solution: Recalibrate sensors, optimize control logic, or upgrade equipment if necessary

Issue 2: Pressure differential instability

• Cause: Poor door/window sealing or improper air balancing

• Solution: Improve sealing and rebalance air volumes

Issue 3: Excessive noise

• Cause: Insufficient vibration isolation or excessive duct air velocity

• Solution: Add isolators and silencers; optimize duct routing

Issue 4: Failed third-party testing

• Cause: Construction quality or equipment performance below standard

• Solution: Rectify based on specific test results and conduct re-testing

4. Key Follow-Up Tasks After Acceptance Approval

After passing acceptance and obtaining qualified third-party test reports, the following steps are required before official operation:

1. Comprehensive disinfection: Formaldehyde fumigation or hydrogen peroxide fogging

2. System trial operation: No-load operation for 3–7 days

3. Management system setup: SOPs for personnel access, material disinfection, and animal care

4. Trial operation monitoring: Continuous parameter monitoring to ensure ongoing compliance

5. Conclusion: Professional Acceptance Is the Foundation for Long-Term Stable Operation

Acceptance of conventional laboratory animal housing rooms is not merely about “passing once.” It requires full compliance with national standards, covering documentation, construction quality, environmental control, equipment performance, fire safety, and third-party verification.

Only by strictly controlling the acceptance process can facilities ensure long-term, stable operation, providing a solid foundation for animal welfare and scientific research.

If you are planning or accepting a conventional laboratory animal housing project, it is recommended to conduct a self-inspection based on this checklist and engage a qualified third-party testing agency. Any identified issues should be promptly rectified in coordination with the contractor to ensure reliable and compliant facility delivery.