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Efficiency Of Bacterial Disinfection
By A
Duct Mounted UV-AireÔ Ô Air Purifier
By:
Kane Environmental Assays
Sanitary & Environmental Microbiology
Bernard E. Kane, Ph.D.
1706 Canterbury Rd
Greenville, NC 27858
Ph. 252.355.6789
Oysterdoctor@aol.com
For:
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Table of Contents Background ..........................................................................................................................3 Organism.........................................................................................................................3 Testing Structure.............................................................................................................3 Testing Airflow Rate................................................................
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Background This product study evaluates the effectiveness of the UV-Aire air purifier in reducing the levels of bacteria with a single pass through a simulated air duct system. This device is designed to irradiate the air as it circulates through the home, so the single pass evaluation is the worst-case scenario use of this device. The air in the home will pass through the heating and air conditioning system many times a day, as the air is circulated throughout the home. Knowing the effe
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ORGANISM APPLICATOR: An atomizing humidifier spray nozzle mounted at the center of the test duct intake was used to distribute the organism into the air stream. The application flow rate was 0.45 gallons per hour. UV DEVICE: A Field Controls UV-Aire air purifier model UV-18 was mounted onto the center of the side of the test duct 6 feet from the exit end of the chamber. The lamp is a UVC germicidal lamp (non ozone producing) 18 inches long with a UV output rating of 73 2 μW/cm
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Testing Procedure The testing was performed in two stages. The first stage operated the test chamber with the lamp off. (See table 1) This developed the control data or the base line bacterial levels for the comparison. The second stage operated the test chamber with the lamp on. (See table 2) Two airflow rates were used to evaluate the lamp effectiveness based on exposure time. Airflow velocities through the ducts of a typical residential heating and cooling system range from 300 t
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Table 1: Control Data (testing with lamp off) Airflow 3 Sample Air Sampling Serratia marcescens Corrected Particle CFU/FT of air Velocity Number Duration (min) Positive hole count Counts (count/min) fpm 1 1 500 181 241 2 1 500 193 263 3 1 500 208 294 4 0.5 500 117 138 5 0.5 500 118 140 Total Corrected Total min. = 4 = 1076 269.00 Particle counts 1 2 1000 168 218 2 2 1000 167 216 3 2 1000 169 220 4 1 1000 91 103 5 1 1000 92 103 Total Corrected Total
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Table 3: UV-18X Test data and results (testing with lamp on) Air Serratia 3 Airflow Corrected CFU/FT Sample Sampling marcescens %Survival Log % Velocity Particle of air Duration Positive hole Number CFU/Control Reduction Effective (fpm) Counts (count/min) (min) count 1 2.5 1000 21 22 2 2.5 1000 27 28 3 2.5 1000 28 29 4 5 1000 48 51 Total Corrected Total min = 12.5 = 130 10.40 9.67 1.01 90.33 Particle Counts Control: 107.50 1 5 500 8 8 2 5
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Conclusion UV-Aire Airflow Percent Reduction Percent Survival of Log Reductions Model velocity of Bacteria Bacteria of Bacteria (fpm) UV-18 500 93.31 6.69 1.17 UV-18 1000 71.99 29.01 0.54 UV-18X 500 99.00 0.95 2.02 UV-18X 1000 90.33 9.67 1.01 The testing showed the UV-Aire lamp yields at least a 90% reduction of the test bacteria with a single airflow pass through a duct system at typical airflow rates. This efficiency will not be the same for all bacteria and molds since ea
