A Comparison of Gas Phase, Needlepoint Bipolar Ionization (NPBI™), and Photohydroionization® (PHI) By now, you probably know that there are several types of air decontamination and filtration technologies available for firefighter apparatus and fire station protection. Gas Phase, Needlepoint Bipolar Ionization, and Photohydroionization are three prominent technologies in the firefighter air decontamination and filtration space. … Continue reading Which Firefighter Air Decontamination Technology is Best?