What does the term 'negative air machine' refer to?

The term 'negative air machine' specifically refers to a device used for removing contaminants from the air. These machines create negative pressure in a designated area, which helps to draw air through filters that capture mold spores, dust, and other airborne pollutants. By maintaining negative air pressure, they help prevent the spread of contaminants to other areas and are often utilized in mold remediation and other clean-up activities to ensure a safer environment. This function is crucial in settings where mold is present, as it aids in controlling air quality and minimizes health risks associated with exposure to harmful particulates.

The other options, while they describe equipment or concepts related to air management, do not accurately define a negative air machine. For instance, a device that solely increases air pressure or cools the air does not serve the primary function of contaminant removal, which is the defining characteristic of a negative air machine.