WS 696-2020 in English
VALIDHygienic Specifications for Operation and Management of Air-conditioning Ventilation Systems in Office Buildings and Public Places during COVID-19 Epidemic
- Issued on:2020-07-20
- Implemented on:2020-07-20
- File Format:PDF
- Delivery:Via email within 1~3 business days
$127.00
| Standard No: | WS 696-2020 |
| Document status: | VALID |
| Title in English: | Hygienic Specifications for Operation and Management of Air-conditioning Ventilation Systems in Office Buildings and Public Places during COVID-19 Epidemic |
| Title in Chinese: | 新冠肺炎疫情期间办公场所和公共场所空调通风系统运行管理卫生规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-07-20 |
| Implemented on: | 2020-07-20 |
| ICS Classification: | 11.020-Medical Sciences and health care facilities in general |
| Chinese Classification: | C51-Environmental sanitation |
| Professional Classification: | WS-Hygiene |
| Related Keywords: | air-conditioning ventilation systems
week enhance ventilation split air conditioner fresh air system high-risk areas all-air system operation fresh air requirements |
| Related Topics: | Public places
Air Conditioning and Ventilation of the Place Public place testing box Public place testing box fresh air volume food in public places Coronavirus disease During the COVID-19 pandemic Hygiene of supplies in public places |
本标准规定了新冠肺炎疫情期间空调通风系统的卫生质量要求、运行管理要求以及日常检查与监测要求。
本标准适用于新冠肺炎疫情期间办公场所和公共场所的空调通风系统的卫生管理，其他传染病流行期间可参照执行。
Introduction
Analysis of the core points of the standard
As a mandatory hygiene specification for epidemic prevention and control, this standard focuses on five common systems, including all-air air-conditioning system and fan coil unit plus fresh air system, and puts forward differentiated management requirements:
| System type | Fresh air requirements | Cleaning frequency | Strategy for high-risk areas |
|---|---|---|---|
| All-air system | Operation with maximum fresh air volume | Weekly disinfection | Shut off return air |
| Fan coil unit + fresh air | Directly take in outdoor fresh air | Disinfection every week | Enhance ventilation |
| Split air conditioner | Need to open windows for ventilation | Disinfection before use | Limited time use |
Key technical requirements
4.1 Hygiene and quality dual standards
The system hygiene must meet both the microbial indicators of WS 394 and the fresh air volume standards of GB 37488, including:
- PM10 in supply air≤0.15 mg/m³
- Total bacteria count≤500 CFU/m³
- Fresh air volume≥30 m³/(h·person)
5.1.2 Operation strategy classification
A case of an office building shows that after adopting high-efficiency filtered return air in medium-risk areas, the return air ratio can be maintained at 50%, but it needs to be coordinated with CO₂ concentration monitoring three times a day.
Implementation recommendations
Emergency management process
- Shut down the corresponding area system within 2 hours after the case is found
- Use chlorine-containing disinfectant to immerse disinfection of the air duct
- Restart only after passing the hygiene evaluation
Daily monitoring focus
Special attention should be paid to the U-type water seal liquid level to prevent aerosol transmission. It is recommended to configure a differential pressure gauge to monitor the fresh air/exhaust air pressure balance.
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