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The Effects of Debris Accumulation Upon Air Flow and Filter Resistance to Air Flow for Four Commercially Available Vacuum Cleaners PDF Version CPWR - The Center for Construction Research and Training
 

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Table D5. Pressure loss and air flows through Dust Director vacuum cleaner 10-11-2007 Round 3

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)

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

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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