Engineering Strategies for Airborne Diseases

H V A C S Y S T E M S T R A T E G I E S

AIR DISINFECTION – UVGI DISADVANTAGES

Ozone

• Ozone production occurs with wavelengths below 240nm. • Titanium Doped (Doped Quartz - Ozone Free) quartz tubes prevent ozone production while natural and synthetic quartz materials still allow transmission.

Human Exposure

• Occupational exposure guidelines for UVGI have been developed by CDC/NIOSH. Exceeding the permissible exposure time can cause short- and long-term damages. • In-unit applications prevent human exposure and allow much higher irradiance.

Courtesy of Helios Quartz