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Table 1: Control Data (testing with lamp off)
Sample
Number
Air Sampling
Duration (min)
Airflow
Velocity
fpm
Serratia marcescens
Positive hole count
Corrected Particle
Counts
CFU/FT
3
of air
(count/min)
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 min. = 4
Total Corrected
Particle counts
= 1076 269.00
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 min. = 8
Total Corrected
Particle counts
= 860 107.50
Table 2: UV-18 Test data and results (testing with lamp on)
Sample
Number
Air
Sampling
Duration
(min)
Airflow
Velocity
(fpm)
Serratia
marcescens
Positive hole
count
Corrected
Particle
Counts
CFU/FT
3
of air
(count/min)
%Survival
CFU/Control
Log
Reduction
%
Effective
1
1 1000 30 31
2
1 1000 32 33
3
3 1000 88 99
4
6 1000 145 180
Total min = 11
Total Corrected
Particle Counts
= 343 31.18 29.01 0.54 70.99
Control:
107.50
1
1 500 13 13
2
1 500 19 19
3
3 500 57 61
4
6 500 92 105
Total min = 11
Total Corrected
Particle Counts
= 198 18.00 6.69 1.17 93.31
Control:
269.00