The Effects of Debris Accumulation Upon Air Flow and Filter Resistance to Air Flow for Four Commercially Available Vacuum Cleaners
Summary Statement
The results of a laboratory study conducted to evaluate how mortar debris affects air flow and pressure losses through a vacuum cleaner’s filters.
May 2008
Table D4. Pressure loss and air flows through Dust Director vacuum cleaner 10-04-2007 Round 2 |
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Before (B) or after (A) adding 5 pounds |
Total weight of debris transferred (lb) |
Venturi meter δP (inches of water) |
Static Pressure Measurements with manometer (inches of water)1 |
Absolute pressures measured with pressure transducers (psi) |
Time to start loading |
Time to stop loading |
Air flow (cfm) |
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Pressure in vacuum cleaner bag (inches of water) |
Pressure after the bag (inches of water |
Pressure after first filter (inches of water) |
Pressure after second filter (inches of water) |
Pressure after the bag (psi) 87614 |
Pressure after first filter (psi) 53748 |
Pressure after second filter (psi) 55481 |
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B |
5.4 |
7.5 |
-6.3 |
-7.1 |
-14.4 |
-18.8 |
14.127 |
13.623 |
13.453 |
3:47pm |
3:48pm |
72.07 |
A |
6.2 |
-4.4 |
-17.8 |
-28.2 |
-32.4 |
13.776 |
13.197 |
12.973 |
|
|
65.57 |
|
B |
10.2 |
6 |
-4.2 |
-17.9 |
-30 |
-33.4 |
13.81 |
13.063 |
12.906 |
3:56pm |
3:58pm |
64.51 |
A |
4.4 |
-2.2 |
-30.8 |
-43.9 |
-47.1 |
13.551 |
12.578 |
12.434 |
|
|
55.22 |
|
B |
15.2 |
4.5 |
-2.2 |
-25.9 |
-42.7 |
-45.7 |
13.634 |
12.595 |
12.46 |
4:06pm |
4:07pm |
55.85 |
A |
3.3 |
-1.9 |
-36.2 |
-52.2 |
-54.8 |
13.467 |
12.244 |
12.123 |
|
|
47.75 |
|
B |
20.2 |
4.1 |
-2.5 |
-28.9 |
-46.5 |
-49.3 |
13.576 |
12.461 |
12.333 |
4:15pm |
4:16pm |
53.29 |
A |
2.15 |
-2 |
-41.9 |
-57.6 |
-59.8 |
13.242 |
12.06 |
11.963 |
|
|
38.39 |
|
B |
25 |
4.55 |
-3 |
-25.9 |
-42.5 |
-45.6 |
13.609 |
12.595 |
12.451 |
4:23pm |
4:24pm |
56.16 |
A |
2.5 |
-1.35 |
-44.9 |
-59.1 |
-61.2 |
13.083 |
12.002 |
11.921 |
|
|
41.46 |
|
B |
30 |
3.7 |
-2.2 |
-33.3 |
-49.2 |
-51.9 |
13.392 |
12.344 |
12.224 |
4:34pm |
4:35pm |
50.59 |
A |
2.4 |
-1.4 |
-45.8 |
-59.4 |
-61.7 |
13.233 |
12.002 |
11.887 |
|
|
40.61 |
|
B |
35.4 |
3.2 |
-1.65 |
-38.8 |
-54.8 |
-57 |
13.359 |
12.169 |
12.039 |
4:44pm |
4:45pm |
47.01 |
A |
1.35 |
-0.9 |
-51.6 |
-63.9 |
-65.4 |
13.551 |
11.826 |
11.727 |
|
|
30.25 |
|
Final |
35.4 |
3.4 |
-1.65 |
-38.5 |
-54 |
-56.9 |
13.484 |
12.177 |
12.039 |
4:50pm |
|
48.47 |
1 Static pressure is the difference in pressure from atmospheric pressure. These static pressures are less than atmospheric pressure. |
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