In which areas of hospitals are high-efficiency exhaust units applied?

High-efficiency exhaust units are mainly applied in hospitals in areas with strict requirements for air cleanliness, pollutant control, or a negative-pressure environment. Their core function is to prevent the spread of harmful microorganisms, chemical pollutants, or odors through high-efficiency filtration, directional exhaust, and safety isolation, protecting the safety of medical staff, patients, and the environment. The specific application areas are as follows.
Areas related to infectious diseases
Isolation wards (such as respiratory infectious disease isolation wards, COVID-19 wards, tuberculosis wards, etc.)
Such areas need to maintain a negative pressure environment to prevent the spread of pathogenic microorganisms (such as viruses and bacteria) exhaled by patients to other areas. The high-efficiency exhaust unit continuously discharges the polluted air in the ward, purifies it through high-efficiency filtration (HEPA), and then discharges it outdoors. At the same time, it works in conjunction with the intake system to form a directional airflow (from the clean area to the contaminated area), reducing the risk of cross-infection.
Fever clinic room and observation room
For patients with potential respiratory infectious diseases, the exhaust unit can quickly expel aerosols containing potential viruses from the consultation room, preventing medical staff from being exposed, while ensuring that the discharged air, after purification, meets environmental protection standards.
2. Operating rooms and sterile operation areas
Clean operating rooms (especially those with high cleanliness levels such as Class 100 and Class 1,000) :
Although the operating room mainly relies on "air supply purification", some special surgeries (such as those involving infectious lesions, tumor resection, etc.) require the coordination of an exhaust system to promptly remove the smoke generated during the operation (such as electrosurgical smoke), body fluids, aerosols, etc. The high-efficiency exhaust unit can be locally set around the operating table to specifically capture and filter pollutants, maintaining the cleanliness of the air in the operating area.
Sterile preparation room (such as the exhaust ventilation of the biosafety cabinet in the Intravenous Drug Preparation center, PIVAS) :
When preparing chemotherapy drugs, antibiotics, etc., volatile chemical substances or drug particles will be produced. The exhaust unit needs to be linked with the biosafety cabinet to filter the polluted air inside the cabinet through high-efficiency filtration and then discharge it, protecting the preparers from the harm of drug toxicity.
3. Laboratory and inspection area
Biosafety laboratories (especially high-level laboratories of BSL-3 and BSL-4 levels) :
For this type of laboratory dealing with pathogenic microorganisms (such as the novel coronavirus, Ebola virus, etc.), exhaust ventilation serves as the core safety barrier. The high-efficiency exhaust unit should be equipped with dual-stage filtration (primary + high-efficiency), in-situ disinfection (such as hydrogen peroxide fumigation), and leak-proof functions to ensure the absolute safety of the discharged air and no pollutant leakage during filter maintenance or replacement.
Pathology Laboratory
When handling specimens, harmful volatile gases such as formaldehyde and xylene, as well as tissue debris aerosols, are produced. The exhaust unit can quickly expel and filter these pollutants to ensure the health of laboratory personnel.
4. Special Treatment and Disposal Area
Burn Ward
The skin barrier of burn patients is damaged, and they are prone to infection. The air in the ward should be kept clean. The exhaust unit can be combined with the fresh air system to control the speed and direction of air circulation, reduce the retention of bacteria, and at the same time remove the unpleasant odor produced by the secretions from the wound.
Nuclear Medicine Department
When handling radioactive drugs (such as iodine-131), radioactive aerosols will be generated. The exhaust unit must be designed to prevent radiation leakage and be equipped with high-efficiency filtration to remove radioactive particles, thus avoiding radiation contamination of the surrounding environment.
5. Waste treatment and logistics area
Temporary storage room for medical waste
The decomposition of garbage can produce foul odors and pathogenic bacteria. The exhaust unit needs to maintain a negative pressure in the area, filter the polluted air, and then discharge it to prevent the spread of odors to the public areas of the hospital.
Sewage treatment station (indoor section)
During the hospital sewage treatment process, toxic gases such as hydrogen sulfide are released. The exhaust unit can promptly discharge and dilute these gases, preventing safety risks caused by excessive concentration.
The core purpose of the application
The application of high-efficiency exhaust units in hospitals essentially achieves three major goals through the combination of "directional exhaust + high-efficiency purification + safety isolation."
Protect medical staff and patients from polluted air (microorganisms, chemicals, radioactive substances, etc.);
Prevent polluted air from spreading to other areas and control cross-infection within the hospital.
Ensure that the air discharged from the hospital complies with environmental protection regulations and does not cause harm to the external environment.
The exhaust units in different areas will be designed specifically in terms of filtration efficiency, sealing performance, disinfection function, etc., based on the types of pollutants (biological, chemical, radioactive) and risk levels.