Full Lifecycle Management of Clean Operating Rooms: A Guide to Acceptance, Operation, and Maintenance

Author:  SHANGHAI WEYUAN MEDICAL DEVICE CO., LTD          
Marketing Department   David
Article Reviewer:  SHANGHAI WEYUAN MEDICAL DEVICE CO., LTD 
Technical Department: Weng Liang
A truly reliable clean operating room is not a project that remains static once the keys are handed over, but rather a living entity that requires continuous care and ongoing validation. An exceptional clean operating room is one-third construction and seven-tenths management—its reliability lies in every day that is carried out with diligence.
Based on national standards such as GB 50333-2013 “Technical Specifications for Hospital Clean Operating Rooms” and GB/T 42392-2023 “General Technical Requirements for Clean Operating Rooms,” this article systematically outlines the key points of full life-cycle management for clean operating rooms—from classification standards, three-stage acceptance, and daily operations to preventive maintenance—providing hospitals and relevant managers with a practical, actionable guide.

I. Classification of Clean Operating Rooms and Standard Requirements

The construction and operation of clean operating rooms first require a clear understanding of classification standards. According to GB 50333-2013, clean operating department facilities are classified based on bacterial concentration under unoccupied or static conditions, with clean operating rooms categorized into Classes I through IV:

Cleanliness standards for operating rooms at all levels encompass multidimensional parameters such as suspended particle concentration, settled and airborne microbial counts, temperature and humidity, pressure differentials, noise levels, and illuminance. Hospitals should construct clean operating rooms of different grades based on the types of surgeries they perform and allocate auxiliary spaces appropriately.

II. Rigorous “Pre-Commissioning Inspection”: Tier-3 Acceptance Standards

The completion of a project does not mean it can be put into immediate use. It must pass a series of rigorous “inspections” to prove that it meets design standards. GB 50333-2013 explicitly stipulates that there are 14 mandatory test items for project inspection; airflow velocity, airflow volume, and static pressure differential should be measured first, while bacterial concentration should be tested last. This inspection process is divided into three scenarios:

1. As-Built Testing: Assessing “Inherent Quality”

Scenario: The indoor cleanroom air conditioning facilities and functions are fully installed but not yet operational, and the room is free of medical equipment and personnel.
Purpose: This is the most basic test, used to verify whether the operating room’s enclosure is airtight, whether the finishing materials meet standards, and whether equipment is properly installed. It assesses the “hard aspects” of the project. Acceptance inspections for new construction projects are typically conducted in an “empty” state.

Note: According to regulations, bacterial concentration testing should be conducted after all other test items have been completed, and routine disinfection of all room surfaces has been performed; air disinfection must not be performed.

2. Static (At-Rest) Test: Verifying “System Performance”

Scenario: The indoor cleanroom HVAC facilities and functions are fully operational, and medical equipment is installed and ready for use, but there are no staff present.

Purpose: This is the most critical acceptance phase, testing whether the cleanroom HVAC system can independently maintain environmental parameters within design standards without human interference. Routine annual inspections also generally use the static mode. Key test items include:

· Air cleanliness: Whether Class I, II, or III design standards are met
· Cross-sectional air velocity and air changes per hour: Class I measures air velocity; Classes II–IV measure air changes per hour
· Static pressure differential: Rooms with higher cleanliness levels should maintain positive pressure relative to those with lower cleanliness levels; minimum static pressure differential ≥5 Pa, maximum <20 Pa
· Temperature and humidity: Temperature 21–25°C, humidity 30–60%

· Noise and illuminance: Noise ≤51 dB(A), minimum illuminance ≥350 lx
· Final-stage filter leak testing: Each HEPA filter air supply outlet must undergo leak testing

Key Note: A single indicator, such as air cleanliness class or bacterial concentration, must not be used to replace a comprehensive evaluation of overall performance. All test results must specify the testing conditions.

3. Dynamic (Operational) Testing: Simulating “Real-World Performance”

Scenario: The indoor cleanroom air conditioning system and all functional equipment are fully operational, and medical staff are performing normal procedures.

Purpose: To evaluate the operating room’s ability to withstand human interference and maintain environmental stability under actual working conditions. If required by the construction party, verification may be conducted under dynamic conditions. Typically, bacterial concentration is measured during dynamic operation to verify whether the operating room consistently meets cleanliness requirements under dynamic operating conditions.

Passing the acceptance inspection merely grants a “certificate of operation.” The true test begins with daily operations.

III. Meticulous “Daily Routine”: Daily Operations Management

After acceptance, standardized operations during daily use are the fundamental guarantee of long-term safety.

1. “Start-up and Shutdown” of the Cleanroom System and Self-Purification Time

The cleanroom air conditioning system in the clean operating department should be turned on 30 minutes before surgery to allow for self-purification and to establish stable temperature, humidity, and pressure differentials.

The minimum self-purification time between surgeries for operating rooms of different classes is as follows:
· Class I clean operating rooms: ≥10 minutes
· Class II and Class III clean operating rooms: ≥20 minutes
· Class IV Clean Operating Rooms: ≥30 minutes

After surgery is complete and cleaning and disinfection are finished, the cleanroom air conditioning system must be allowed to continue running until it reaches the respective self-cleaning time before being shut down, to ensure that contaminants are thoroughly removed.

2. “Lifecycle” Management of Filters

Filters are not permanent; they have a “service life.” They must be replaced strictly according to differential pressure alarms or scheduled time intervals.

3. Continuous “Environmental Monitoring”

Temperature, humidity, and pressure differentials are monitored and recorded 24 hours a day without interruption via the automated control system. Any abnormalities detected must be investigated immediately.

Monitoring Frequency Requirements: Hospitals should conduct quarterly monitoring of high-risk infection departments; monitoring should be performed during the acceptance inspection of new or renovated clean operating rooms, as well as after replacing high-efficiency filters; and each clean room must be monitored at least once a year.

IV. Continuous “Maintenance and Care”: Preventive Maintenance

Waiting until equipment breaks down before repairing it is too late. The core of preventive maintenance is to nip problems in the bud.

1. Regular Maintenance of the Cleanroom System

· Regularly clean fresh air inlets, flush heat exchangers, and empty condensate pans to prevent them from becoming new sources of contamination or breeding grounds for bacteria
· Clean the return air grilles in operating rooms and auxiliary rooms once a week
· Perform a comprehensive technical maintenance of the operating department’s cleanroom system every six months (including humidifiers, automated control systems, air handling units, and various valves)

· Annually commission and test the clean operating room’s air quality parameters in accordance with GB 50333-2013

2. Daily Maintenance of Finishes and Equipment

· Periodically inspect the integrity of walls and floors to ensure there are no cracks or damage. Wall joints should feature rounded corners to prevent dust accumulation in hard-to-reach areas
· Inspect the rotational airtightness of the surgical tower, the flexibility of the surgical light joints, and all functions of the operating table
· Ensure that all equipment is in optimal condition at all times

3. Hygiene Monitoring

Conduct regular bacterial cultures of the air and surface swabs to verify the effectiveness of the entire infection control system through data. GB 50333-2013 stipulates that the bacterial fallout in Class I operating rooms must be ≤0.2 CFU/plate (30 min), and in Class II/III operating rooms, ≤0.5 CFU/plate.

V. Weyuan Medical: Going Beyond Delivery to Build Long-Term, Trusted Partnerships

As a manufacturer, Weyuan Medical’s sense of responsibility does not end with project delivery. We fully understand that a clean operating room is a life-support system that operates 24/7, and its long-term stability is of the utmost importance.

A Reliable Domestic Brand Ensures Maintenance Efficiency

The core equipment we provide—such as the “Light-Table-Tower” system (surgical lights, ceiling-mounted towers, and operating tables)—is manufactured by a high-quality domestic brand. Not only does it deliver outstanding performance, but it also offers inherent advantages such as rapid service response, ample spare parts supply, and manageable maintenance costs. This alleviates concerns regarding the hospital’s long-term operation and maintenance.

Extended Services for Comprehensive Solutions

Weyuan Medical can provide you with:

· Professional maintenance manuals: Covering operational standards for the entire process, from daily inspections to annual overhauls
· Operator training: Ensuring frontline staff are proficient in equipment operation and daily maintenance skills
· Access to post-installation maintenance resources: Based on our strong partnerships with cleanroom engineering providers, we connect you with reliable post-installation maintenance resources

Building a Long-Term, Trusted Partnership

We aim to establish a long-term, trusted strategic partnership with our clients to jointly safeguard the entire lifecycle of your clean operating suite.

Contact us to obtain a customized maintenance plan for your clean operating suite.

Frequently Asked Questions (FAQ)

Q1: How often does a clean operating suite require a comprehensive inspection?
A: According to GB 50333-2013, clean operating rooms should be inspected at least once a year; inspections are mandatory after replacing HEPA filters, as well as during acceptance inspections for new construction or renovation projects.

Q2: Under what circumstances must HEPA filters be replaced?
A: They should be replaced when the pressure drop exceeds the initial design pressure drop of 160 Pa, or when they have been in use for more than 3 years. A leak test should be performed after each replacement.

Q3: How long does it take for a clean operating room to self-purify between consecutive surgeries?
A: At least 10 minutes for Class I clean operating rooms, at least 20 minutes for Class II and Class III, and at least 30 minutes for Class IV.

Q4: What mandatory test items are included in the acceptance inspection of a clean operating department?
A: According to GB 50333-2013, there are a total of 14 mandatory test items for project inspection, including cross-sectional air velocity, air changes per hour, fresh air volume, final filter leak testing, operating room airtightness, static pressure differential, air cleanliness class, temperature and humidity, noise, illuminance, formaldehyde/benzene/TVOC concentrations, bacterial concentration, and harmonic distortion rate.
This article is based on GB 50333-2013 “Technical Specifications for the Construction of Hospital Clean Operating Departments,” GB/T 42392-2023 “General Technical Requirements for Clean Operating Departments,” and relevant industry standards.