The PHI-PKG air purification system is designed for use in commercial HVAC systems. It uses our revolutionary PHI-CELL technology that produces low levels of airborne hydrogen peroxide in the air that are effective at reducing bacteria, mold spores, viruses and odors. Our PHI-PKG system brings Mother Nature s natural cleaning process into your building. You ll have peace of mind knowing you are doing everything you can to protect your workers and guests from unwanted germs