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 D5. Pressure loss and air flows through Dust Director vacuum cleaner 10-11-2007 Round 3 |
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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 |
8 |
-6.5 |
-7.2 |
-11.6 |
-15.5 |
14.202 |
13.765 |
13.588 |
4:50pm |
4:51pm |
74.41 |
A |
6.4 |
-4.5 |
-11.5 |
-28.5 |
-31.8 |
14.093 |
13.172 |
12.998 |
|
|
66.62 |
|
B |
10.6 |
6.3 |
-4.4 |
-11.5 |
-28.4 |
-32.2 |
14.085 |
13.155 |
12.864 |
4:59pm |
5:00pm |
66.10 |
A |
5.1 |
-2.9 |
-16.9 |
-40.9 |
-44.2 |
13.943 |
12.729 |
12.544 |
|
|
59.47 |
|
B |
15.6 |
4.5 |
-2.7 |
-7.8 |
-43.2 |
-46.6 |
14.21 |
12.612 |
12.493 |
5:08pm |
5:09pm |
55.85 |
A |
3.3 |
-1.7 |
-8.9 |
-53.8 |
-56.7 |
14.194 |
12.269 |
12.098 |
|
|
47.75 |
|
B |
20.8 |
5.4 |
-3.5 |
-6.7 |
-36.8 |
-40.5 |
14.21 |
12.854 |
12.695 |
5:17pm |
5:18pm |
61.20 |
A |
3.3 |
-1.6 |
-7.6 |
-54.3 |
-57 |
14.235 |
12.244 |
12.089 |
|
|
47.75 |
|
B |
25.8 |
4.3 |
-2.5 |
-6.2 |
-45.8 |
-49.4 |
14.252 |
12.512 |
12.359 |
5:26pm |
5:27pm |
54.58 |
A |
2.5 |
-1.4 |
-6.9 |
-59.9 |
-62.7 |
14.244 |
12.027 |
11.887 |
|
|
41.46 |
|
B |
30.8 |
5 |
-3 |
-6.5 |
-39.7 |
-43.7 |
14.227 |
12.746 |
12.586 |
5:38pm |
5:39pm |
58.88 |
A |
2.8 |
-1.4 |
-8.8 |
-57.9 |
-60.6 |
14.16 |
12.119 |
11.954 |
|
|
43.92 |
|
B |
36 |
4.4 |
-2.5 |
-7.3 |
-45.3 |
-48.8 |
14.185 |
12.545 |
12.392 |
5:46pm |
5:47pm |
55.22 |
A |
2.2 |
-1.1 |
-12.6 |
-62.7 |
-65.4 |
14.06 |
11.927 |
11.803 |
|
|
38.84 |
|
Final |
36 |
4.6 |
-2.5 |
-8.9 |
-43.8 |
-47.7 |
14.144 |
12.587 |
12.434 |
5:54pm |
|
56.47 |
1 Static pressure is the difference in pressure from atmospheric pressure. These static pressures are less than atmospheric pressure. |
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