What is the recommended minimum number of power sources for negative air pressure units?

The recommended minimum number of power sources for negative air pressure units is two. This guideline is crucial for ensuring reliability and safety in environments where asbestos abatement or similar hazardous material work is being conducted. Having two power sources helps to reduce the risk of failure; if one power source were to go down, the other can continue to operate the negative air pressure unit effectively. Maintaining proper negative pressure is essential for controlling the spread of airborne contaminants, which is particularly important during asbestos handling and removal activities. This redundancy in power supply supports ongoing operation, helps maintain safe work conditions, and adds layers of protection both for workers and the surrounding environment.