When can negative pressure machines be turned off?

The correct answer is when the final air quality level of 0.01f/cc is obtained. This standard indicates a specific threshold for airborne asbestos fibers that must be met before it is considered safe to halt operations of negative pressure machines. These machines are designed to create a containment environment by pulling air from the worksite, ensuring that asbestos fibers do not escape. The safe limit of 0.01 fibers per cubic centimeter (f/cc) represents a level at which the air in the work area is adequately cleared of hazardous materials, allowing for a reduction in containment measures.

Turning off negative pressure machines should only occur once this air quality goal is achieved, reflecting the importance of maintaining safety protocols in asbestos abatement practices. By adhering to this standard, workers are less likely to be exposed to potentially harmful airborne asbestos, thus protecting their health and complying with safety regulations.