HEPA / ULPA Filters
Operating Room / Negative-Pressure Isolation Ward Hospital HEPA Box
Product Overview
The HEPA box used in operating rooms and negative-pressure isolation wards is a standalone enclosure or filtration module containing a high-efficiency particulate air (HEPA) filter. It is a key piece of equipment for maintaining specified air cleanliness and isolation performance.
Features & Specifications
Differences in air filtration between operating rooms and negative-pressure isolation wards
Operating Room (positive-pressure environment)
● Purpose: To protect the patient from bacteria, viruses, and particulate contamination in ambient air, preventing surgical site infection.
● Role of the HEPA box: The HEPA box is usually part of the cleanroom HVAC system and filters the supply air entering the operating room. It efficiently removes airborne particulates, maintaining positive pressure in the operating room and ensuring that airflow moves from inside the OR outward.
● HEPA filter grade: Typically uses HEPA filters with filtration efficiency of 99.97% or higher (against 0.3 micron particles) to comply with strict medical cleanroom standards.
Negative-Pressure Isolation Ward (negative-pressure environment)
● Purpose: To isolate infectious pathogens and prevent contaminated air from patients from leaking out, protecting medical staff, other patients, and the environment.
● Role of the HEPA box: Usually used in the ward's exhaust system, drawing air from the ward, filtering it through high-efficiency media, and exhausting it outside. By making the exhaust airflow exceed the supply airflow, the ward's internal pressure is kept below the outside, achieving negative-pressure isolation.
● Role of the HEPA filter: The HEPA box on the exhaust side ensures that contaminated air carrying pathogens is purified before being exhausted, preventing contamination from spreading.
● Equipment types: Besides fixed HVAC exhaust systems, portable HEPA filtration units are also available for temporary isolation areas, emergency rooms, or during patient transport.
Detailed Description
| Feature | Operating Room | Negative-Pressure Isolation Ward |
|---|---|---|
| Air Pressure | Positive pressure (interior higher than exterior) | Negative pressure (interior lower than exterior) |
| Purpose | Protect the patient (from infection) | Isolate the patient (to prevent transmission) |
| HEPA box location | Usually on the supply-air side | Usually on the exhaust-air side |
| Airflow direction | From inside out | From outside in |
| Equipment form | Often part of the central HVAC system | Can be a fixed exhaust system, or a standalone or mobile unit |
Dimension Diagram
Air Flow and Pressure Drop Characteristics
HEPA H13 / H14
Air Flow and Pressure Drop Characteristics
ULPA U15 / U16
