Ten scientific reasons in support of airborne transmission of SARS-CoV-2

“If an infectious virus spreads predominantly through large respiratory droplets that fall quickly, the key control measures are reducing direct contact, cleaning surfaces, physical barriers, physical distancing, use of masks within droplet distance, respiratory hygiene, and wearing high-grade protection only for so-called aerosol-generating health-care procedures. Such policies need not distinguish between indoors and outdoors, since … Read more

UVGI design basics for air and surface disinfection (2000)

Lethal to microorganisms, ultra-violet radiation in the range of 2250 to 3020 angstroms is used in a variety of disinfection applications, a process referred to as ultra-violet germicidal irradiation (UVGI). Since the first UVGI system was successfully implemented for disinfecting the municipal water system in Marseilles, France, in 1909, the disinfection of medical equipment using … Read more

SARS Coronavirus UV Susceptibility

UV SARS effectiveness

Severe Acute Respiratory Syndrome (SARS) virus is an emerging respiratory infection that has caused outbreaks in health care settings (Ho et al 2003, HWFB 2003). SARS virus is a new variant of the coronavirus family and transmits through the air and by direct contact. (He et al 2003, CDC 2003). SARS coronavirus is one of … Read more

JBJS – Ultraviolet Lighting During Orthopaedic Surgery and the Rate of Infections

All procedures that were performed before the installation of the ultraviolet lighting used horizontal laminar airflow, whereas all procedures that were performed after that date used ultraviolet lighting without laminar airflow. Factors associated with the rate of infection were analyzed. Results: Over a nineteen-year period, forty-seven infections occurred following 5980 joint replacements. The infection rate … Read more

Guidelines for Design and Installation

The International Ultraviolet Association (IUVA) Draft Guidelines for UVGI Air Treatment Systems are international voluntary guidelines developed under the auspices of the IUVA. This consensus represents a substantial agreement reached by parties in Academia and Industry with direct or indirect interests in air treatment with UVGI and related technologies. This consensus signifies the concurrence of … Read more

Design and Optimization of UVGI Air Disinfection Systems

Mathematical models of the response of populations of microorganisms exposed to ultraviolet germicidal irradiation (UVGI) are developed that include two-stage response curves and shoulder effects. Models are used to develop a C++ computer program that is capable of predicting the performance of UVGI air disinfection systems. The algorithms are based on models for 1) the … Read more

Dimensional Analysis of UVGI Air Disinfection Systems

A dimensional analysis of ultraviolet germicidal irradiation (UVGI) air disinfection system within a diffusely reflective enclosure is performed using the Buckingham pi theorem. The eight dimensionless parameters obtained include the duct aspect ratio, the lamp aspect ratio, the reflectivity, and terms that incorporate the UV dose, airflow, duct dimensions, and lamp location coordinates. Computer simulation … Read more

The Best Way to Improve Indoor Air Quality

foto stick UVC disinfection

Heating, ventilation and¬†air conditioning (HVAC) systems are the perfect breeding ground for bacteria, viruses, pathogens, spores, molds, and more. Air recirculation, temperature fluctuations, and humidity within these systems promote the growth and distribution of microorganisms. This environment allows them to combine with each other in complex ways, and settle all over surfaces inside an HVAC … Read more

How Light Progress can help disinfect your classrooms

light progress helps disinfect classrooms

Keeping your school classroom clean can be a constant battle. With so many students passing through your door, the high traffic nature can make it a significant challenge to keep germs away. On average, a classroom keyboard will have an incredible¬†3,300 different bacteria per square inch, while it takes just two days after cleaning your … Read more

All ultraviolet disinfection products pose a UV radiation hazard. Use only as directed. Protect eyes and skin from exposure to UV light.