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UV Air Purification Using An Air Purifier (Part 2)
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Contaminant Kill Rate
The energy required to kill microorganisms through air purification is a product of the UV light's intensity
and exposure time. This energy is measured in micro-watt seconds per square
centimeter.
UV Energy Required for 99% Kill Rate
| Bacteria |
mWS/cm2 |
| Bacillus anthracis |
8,700 |
| Corynebacterium diptheriae |
6,500 |
| Escherichia coli |
7,000 |
| Legionella pneumophila (Legionnaires Disease) |
3,800 |
| Leptospira interrogans (Infectious Jaundice) |
6,000 |
| Salmonella enteritidis |
7,600 |
| Salmonella typhosa (Thyphoid Fever) |
6,000 |
| Shigella dysenteriae (Dysentery) |
4,200 |
| Streptococcus hemolyticus |
5,500 |
| Vibrio cholerae (Cholera) |
6,500 |
| Virus |
mWS/cm2 |
| Bacteriophage (E. Coli) |
6,600 |
| Hepatitis virus |
8,000 |
| Influenza virus |
6,600 |
| Poliovirus |
21,000 |
| Rotavirus |
21,000 |
| Yeasts |
mWS/cm2 |
| Baker's Yeast |
6,600 |
| Brewer's Yeast |
8,800 |
| Mold |
mWS/cm2 |
| Aspergillus flavus |
60,000 |
| Mucor racemosus |
17,000 |
| Oospora lactis |
6,000 |
| Penicillium digitatum |
44,000 |
Warning: Never expose eyes or skin to UV-C light. UV lamps must only be operated inside
metal ductwork where the light can be contained.
Intensity Of The Light Diminishes Over Distance From Purifier
UV rays are predominantly emitted perpendicular to the surface of the air purification lamp. In
order to determine the intensity of ultraviolet radiation on a surface at
different distances from a UV lamp purifier, multiply the intensity of the lamp rating
at 1 meter (microWatts per square centimeter) by the intensity factor opposite
the distance selected as shown below. This table provides an easy method for
quickly calculating ultraviolet intensity.
| Distance from Lamp Purifier (Inches) |
Intensity Factor |
| 0 |
354 |
| 1 |
127 |
| 2 |
69 |
| 4 |
32 |
| 6 |
20 |
| 8 |
14 |
| 10 |
14 |
| 15 |
6 |
| 20 |
4 |
| 25 |
3 |
| 30 |
2 |
| 35 |
1.4 |
| 39.37 |
1 |
For example, to determine the
ultraviolet intensity produced through a purifier by one 37 microWatt lamp rating at 1 meter at a
distance of 6 inches from the lamp, multiply the rated intensity of the lamp,
by the intensity factor given opposite 6 inches, which is 20:
37 X 20 = 740 microWatts/cm2
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Ste. S 6 