A negative pressure room maintains air pressure lower than surrounding spaces, causing air to flow inward rather than outward. This containment strategy prevents contaminated air from escaping the room and affecting adjacent areas. Negative pressure is commonly measured in pascals (Pa) and typically ranges from -2.5 to -12.5 Pa relative to hallways.
Technical Details
Negative pressure rooms use exhaust-dominant HVAC systems where exhaust air volume exceeds supply air volume. The pressure differential is achieved through dedicated exhaust fans and sealed room construction. Rooms are equipped with airlocks or anteroom entries to maintain pressure integrity during personnel movement.
Applications
These rooms are essential in hospitals for isolation wards treating airborne diseases, pharmaceutical manufacturing for hazardous material handling, and research facilities studying infectious agents. They protect occupants outside the room from potential exposure.
Practical Significance
Proper negative pressure maintenance requires continuous monitoring using differential pressure gauges and regular maintenance of exhaust systems. Failures in pressure differential can compromise isolation protocols and create liability concerns in healthcare and laboratory settings.