Which type of filters do negative air pressure systems use?

Negative air pressure systems primarily utilize HEPA filters due to their high efficiency in trapping very small particles, including asbestos fibers. HEPA, which stands for High-Efficiency Particulate Air, filters are designed to capture at least 99.97% of airborne particles that are 0.3 microns in size. This is particularly important when working in environments where asbestos is present, as exposure to airborne asbestos fibers can lead to serious health issues.

The use of HEPA filters in negative air pressure systems helps ensure that the air being exhausted from the work area does not release hazardous particles back into the surrounding environment. By maintaining a negative pressure, these systems draw air through the HEPA filters, effectively filtering out contaminants, thus providing a safer work environment for workers who may be exposed to asbestos. This function is crucial in mitigating the risks associated with asbestos exposure, which is a significant concern in construction and demolition projects involving asbestos-containing materials.