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ASHRAE Air Filter Efficiency Testing - Oneida Air
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Particle Size Efficiency |
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| Range Number | 1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
|
Size Range (micron) |
0.30-0.40 |
0.40-0.55 |
0.55-0.70 |
0.70-1.00 |
1.00-1.30 |
1.30-1.60 |
1.60-2.20 |
2.20-3.00 |
3.00-4.00 |
4.00-5.50 |
5.50-7.00 |
7.00-12.00 |
|
| Geometric Mean Particle Size (micron) | 0.35 |
0.47 |
0.62 |
0.84 |
1.14 |
1.44 |
1.88 |
2.57 |
3.46 |
4.69 |
6.20 |
8.37 |
Avg. PD in w.g. |
| Initial | 18.4 |
21.9 |
30.7 |
48.1 |
70.1 |
81.6 |
89.9 |
95.0 |
98.0 |
99.0 |
99.4 |
99.5 |
|
| 1st Loading | 42.3 |
51.3 |
64.4 |
78.6 |
90.6 |
94.6 |
97.4 |
98.6 |
99.6 |
99.8 |
99.9 |
99.5 |
0.99 |
| 2nd Loading | 85.8 |
90.8 |
95.5 |
98.1 |
99.4 |
99.7 |
99.9 |
100.0 |
100.0 |
100.0 |
100.0 |
100.0 |
1.47 |
| 3rd Loading | 93.5 |
96.5 |
98.6 |
99.5 |
99.9 |
99.9 |
100.0 |
100.0 |
100.0 |
100.0 |
100.0 |
100.0 |
2.14 |
| 4th Loading | 97.6 |
98.9 |
99.7 |
99.9 |
100.0 |
100.0 |
100.0 |
100.0 |
100.0 |
100.0 |
100.0 |
100.0 |
2.59 |
| 5th Loading | 98.6 |
99.5 |
99.8 |
99.9 |
100.0 |
100.0 |
100.0 |
100.0 |
100.0 |
100.0 |
100.0 |
100.0 |
2.93 |
| The data shown in in the section of the chart highlighted in yellow represents the operational range of the air filter in a wood dust collection application. |
The data in columns 1-12 above represents the filtration efficiency in % across a range of particle sizes (mean, or average, particle size from 0.35 micron to 8.37 micron). Filtration efficiency is simply the number of particles that the air filter traps out of the total number “dumped” into the test ductwork upstream of the air filter during the test. Note that it takes only a small amount of dust to increase the filtration efficiency across all 12 particle size groups to near 100% (the first two dust loadings introduced 9 & 28 grams of dust respectively into the test ductwork). 37 grams (or 1.3 ounces of dust) would likely be introduced into the air filter after only a few hours of operation of the dust collector. Once the filter is “seasoned” or “conditioned” with a small amount of wood dust, its filtration efficiency stays at near 100% for years even after repeated, and thorough, cleanings.