- UV-Light: Proper coverage inside an AHU can achieve a 99.98% kill rate.
- Bipolar Ionization: Achieves a 99.4% Reduction Rate of COVID-19 surface strains.
1. Is there documentation on the health and safety risks provided by the manufacturer? I am specifically wondering about ozone.
The germicidal UV lamps used are monochromatic – they emit over 90% of their energy at 253.7nm wavelength, which does NOT produce Ozone. The Ozone producing wavelength is 185nm, much shorter than the germicidal wavelength, and is produced by different type lamps which emit radiation at both 253.7nm and 185nm wavelengths.
Direct exposure of unprotected eyes and skin to germicidal UV energy must always be avoided, but if accidental exposure occurs, it will not immediately result in injury. The American Conference of Governmental Industrial Hygienists (ACGIH) Committee on Physical Agents has established a TLV (Threshold Limit Value) for UV-C exposure to avoid skin and eye injuries. For 253.7nm UV, this TLV is 6mJ/cm².
2. Are the lamps professionally installed?
The lamps are installed by journeyperson electricians and technicians based on manufacturer provided recommendations.
3. What kind of lamps are they? (Low pressure mercury? Excimer? Far UVC? Pulsed xenon? LEDs?)
The lamps are low pressure, mercury vapor, high output, monochromatic lamps, which emit over 90% of their radiant energy at 253.7nm wavelength.
4. How long is air in contact with UV light as it moves through? What length of the ducts will have these lamps installed?
Sizing and exposure time calculations are done based on the dimensions from existing ductwork and CFM to ensure sufficient contact time for at least 90% first pass inactivation of airborne viruses and bacteria.
5. What specific wavelength do they emit?
253.7nm wavelength
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