Hospital Air Purification Management Specification

Hospital Air Purification Management Specification

Comprehensive guidelines for air quality management in healthcare facilities

1 Scope

This standard specifies the management and hygienic requirements, air purification methods and air purification effects of hospital air purification. This standard applies to hospitals of all levels and categories. Other medical institutions may refer to it for implementation.

Hospital air purification management

Hospitals & Medical Facilities – DarkhorseAir

2 Normative references

The following documents are essential for the application of this document. For all dated references, only the dated documents are used. For all undated references, the latest version (including all amendments) applies to this document.

GB15982 Hospital Disinfection and Hygiene Standards
GB50333 Technical Specifications for the Construction of Clean Operating Rooms in Hospitals
Hygienic Standards for Central Air Conditioning and Ventilation systems in Public Places Ministry of Health
Hygienic Evaluation Standards for Central Air Conditioning and Ventilation Systems in Public Places Ministry of Health
Cleaning Standards for Central Air Conditioning and Ventilation Systems in Public Places Ministry of Health

3 Terms and Definitions

The following terms and definitions apply to this document.

Term	Definition
1 Air purification	Technology or methods to reduce microorganisms, particulate matter, etc. in indoor air to make them harmless.
2 Clean operating room (room)	An operating room (room) that adopts certain air purification technologies to make the air colony count and dust particle count meet the corresponding cleanliness grade standards.
3 Natural ventilation	Ventilation that uses the heat pressure or wind pressure caused by the density difference between the air inside and outside the building to promote air flow.
4 Central air conditioning and ventilation system	The sum of all equipment, pipelines and accessories, instruments and meters for processing, transportation and distribution in order to make the parameters such as air temperature, humidity, cleanliness and air flow velocity in the room or closed space meet the set requirements.
5 Air purification and disinfection device	A device that removes microorganisms, particulate matter and gaseous pollutants in the air supplied by the central air conditioning and ventilation system.

Figure 2: Clean operating room

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Figure 3: Air purification and disinfection device

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4 Management and hygiene requirements

1 Air purification management requirements

The hospital should formulate corresponding air purification management system in accordance with the provisions of laws, regulations and standards related to air purification and disinfection, combined with the actual situation of the hospital, and organize its implementation.
The hospital should train the users and managers of air purification and disinfection facilities and medical staff on the knowledge of laws, regulations and standards related to air purification and disinfection, clarify their respective responsibilities and tasks, and ensure the normal operation of air purification facilities.
Hospitals should take appropriate air purification measures based on infection risk assessment of clinical departments to ensure that indoor air quality meets the requirements of relevant national standards.
Hospitals should inspect and guide the air quality of relevant clinical departments throughout the hospital.

2 Air purification and hygiene requirements

Clean operating rooms (rooms) and other clean places (such as clean bone marrow transplant wards), during new construction and renovation acceptance, after replacing high-efficiency filters, and during daily monitoring, the total number of bacterial colonies in the air should meet the requirements of GB50333.
The total number of bacterial colonies in the air of non-clean operating rooms (rooms), non-clean bone marrow transplant wards, delivery rooms, catheter rooms, neonatal rooms, organ transplant wards, burn wards, intensive care units, and hematology wards is ≤4cfu/(15min diameter 9cm plate).
The total number of bacterial colonies in the air of pediatric wards, mother-child rooms, obstetrics and gynecology examination rooms, abortion rooms, treatment rooms, injection rooms, dressing rooms, blood transfusion departments, disinfection supply centers, hemodialysis centers (rooms), emergency rooms, laboratories, various general wards, infectious disease clinics and their wards is ≤4CFu/(5min diameter 9cm plate).

Air purification and disinfection monitoring

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5.1 Ventilation Methods

1Mechanical Supply & Natural Exhaust

Suitable for places where pollution sources are dispersed and indoor air pollution is not serious.

Key requirement: The mechanical air supply outlet should be away from doors and windows.

2Natural Supply & Mechanical Exhaust

Suitable for places with heavy indoor air pollution.

Key requirement: Indoor exhaust vents should be far from the door and placed on the opposite wall.

3 Mechanical Supply & Exhaust

Suitable for places with high requirements for sanitary conditions.

Key requirement: Set air changes or maintain room pressure based on ventilation needs.

4 Precautions

Consider the functional requirements of the room, sanitary conditions of adjacent rooms, and indoor/outdoor environmental factors when selecting ventilation method and room pressure
Mechanical ventilation equipment should be cleaned regularly and disinfected immediately when contaminated

Figure 5

Central air conditioning ventilation system

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5.2 Central Air Conditioning and Ventilation System

1Health Management

Central air conditioning and ventilation systems should strengthen health management and comply with relevant national regulations.

2Sanitary Requirements

Sanitary requirements and testing methods should comply with the "Sanitary Standards for Central Air Conditioning and Ventilation Systems in Public Places".

3 Hygienic Evaluation

Hygienic evaluation shall comply with the "Hygienic Evaluation Standards for Central Air Conditioning and Ventilation Systems in Public Places".

4 System Cleaning

Cleaning shall comply with the "Cleaning Standards for Central Air Conditioning and Ventilation Systems in Public Places".

Figure 6

Advanced air purification technologies

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5.3 Air Purification Technologies

1 Design Requirements

The design of clean operating rooms (rooms) and other clean places shall follow the requirements of GB50333.

2 Maintenance Requirements

Component	Maintenance Schedule
Coarse filter (fresh air unit)	Clean every 2 days; replace every 1-2 months
medium filter	Check weekly; replace every 3 months
Sub-high efficiency filter	Replace every year
Terminal high-efficiency filter	Check yearly; replace when pressure >160Pa or after 3 years
Return Air Filter	Clean weekly; replace yearly

Set up special maintenance management personnel and formulate operation manuals with inspection records.

Figure 7

3 Ultraviolet Disinfection

Application: Unmanned indoor air disinfection

Method: UV lamps suspended or mobile for direct irradiation (≥1.5W/m³)

Duration: 230 minutes minimum

Ultraviolet disinfection

Figure 8

4 Electrostatic Adsorption

Application: Indoor air purification with people present

Principle: Electrostatic adsorption and filtration to eliminate dust and microorganisms

Requirement: Air volume >8× room volume

Electrostatic adsorption air sterilizer

Figure 9

5 Chemical Disinfection

Application: Unmanned indoor air disinfection

Methods: Ultra-low volume spray or fumigation

Agents: H₂O₂, peracetic acid, ClO₂, ozone

Chemical disinfection method

6 Air Purification Methods for Different Departments

Operating Department

Central HVAC with purification devices
Air purification technology
UV air disinfectors
Electrostatic adsorption units
UV light disinfection

Standard: Bacterial count ≤4CFU/(15min·9cm plate)

High-Risk Areas

(Delivery, NICU, ICU, Burn Wards, etc.)

Ventilation
Central HVAC with purification
Air purification technology
UV/electrostatic disinfectors
UV disinfection

Standard: Bacterial count ≤4CFU/(15min·9cm plate)

General Areas

(Pediatric, ER, Labs, Wards, etc.)

Ventilation
Central HVAC systems
UV/electrostatic disinfectors
UV disinfection
Chemical disinfection

Standard: Bacterial count ≤4CFU/(5min·9cm plate)

Figure 10

Mechanical ventilation in general ward

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7 Air Purification Methods in Different Situations

With People Present

Natural ventilation (preferred)
Mechanical ventilation
Central HVAC systems
UV/electrostatic disinfectors
Air purification technology

Unoccupied Spaces

Methods from 7.1
UV disinfection
Chemical disinfection
Ultra-low volume spray disinfection

Respiratory Infection Areas

Ventilation (natural/mechanical)
Negative pressure isolation
Central HVAC with purification
Certified air purification Equipment

After Patient Discharge (General)

Ventilation
UV irradiation disinfection
Certified air purification equipment

After Discharge (Respiratory)

UV irradiation disinfection
Chemical disinfection
Certified air purification equipment

Figure 11

Managing air quality in infection zones

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8 Monitoring of Air Purification Effect

1 Monitoring Department

Hospitals should monitor air purification quality in high-risk departments:

Operating roomsDelivery roomsCatheter roomsNICU
ICUBurn wardsTransplant wardsHemodialysis centers

2 Monitoring Requirements

1 Monitoring Frequency

High-risk departments: Quarterly
Clean operating rooms: At construction/renovation acceptance & after filter replacement
During suspected infection outbreaks: Immediate monitoring with pathogen testing