What does it mean when an area is described as negatively pressurized?

When an area is described as negatively pressurized, it indicates that the pressure inside that area is lower than the pressure outside of it. This creates a condition where air from the outside is effectively drawn into the area. If air is blowing out of the area, that would typically refer to a positively pressurized environment, where the internal pressure is higher than the external pressure.

In the context of mold remediation, maintaining a negatively pressurized environment is crucial to prevent the spread of mold spores to other areas during the remediation process. By establishing a negative pressure, any air that may contain contaminants is pulled into the area, rather than allowing contaminants to escape outside. Therefore, the correct understanding of a negatively pressurized space is that air is being drawn into that area, which helps control the flow of particles and maintain a safer environment during mold removal.