The Effects of Debris Accumulation Upon Air Flow and Filter Resistance to Air Flow for Four Commercially Available Vacuum Cleaners

Table B3. Pressure loss and air flows through DustControl 2700 Vacuum Cleaner 09/07/2007 Round 1

Before (B) or after (A) adding 5 pounds

Total weight added to vacuum cleaner (lb)

Venturi meter δP (inches of water)

Static Pressure Measurements made with manometer (inches of water)¹

Absolute pressure measured with pressure transducers.(psia)

Time to start loading

Time to stop loading

Filter pressure loss inches of water, corrected for calibration curve of the pressure transducers

Air flow from venturi meter (cfm)

Upstream “before cyclone”

Downstream “after cyclone”

δP

Upstream of final filter (55481)

Downstream of filter at inlet to vacuum cleaner motor. (53478)

B

5.025

10.6

 -7.1

-13

5.9

13.52

13.489

10:23am

10:25am

1.39

85.45

A

8.3

-5.6

-6.4

0.8

13.79

13.205

16.7

75.78

B

5.03

8.9

-4.3

-6.4

2.1

13.807

13.096

10:43am

10:45am

20.2

78.43

A

7.9

-3.9

-5.9

2

13.824

13.013

22.9

73.95

B

4.895

9

-4.4

-6.7

2.3

13.807

13.188

10:54am

10:56am

17.6

78.86

A

8.1

-4

-5.9

1.9

13.807

13.055

21.3

74.87

B

5.4

8.3

-4.4

-6.3

1.9

13.815

13.121

11:07am

11:09am

19.7

75.78

A

7.8

-3.8

-5.5

1.7

13.84

13.038

22.7

73.49

B

5.075

8.6

-4.4

-5.8

1.4

13.832

13.147

11:18am

11:20am

19.5

77.11

A

7.7

-3.3

-5.4

2.1

13.824

12.946

24.8

73.02

B

4.975

7.9

-3.9

-6.2

2.3

13.84

13.046

11:42am

11:44am

22.4

73.95

A

7.6

-3.6

-5.3

1.7

13.874

12.896

27.5

72.55

B

4.985

8.6

-4.1

-6

1.9

13.807

13.121

11:56am

11:58am

19.5

77.11

A

8

-3.7

-5.5

1.8

13.84

13.005

23.6

74.41

Final

7.5

-3.8

-6.9

3.1

13.807

13.155

12:08pm

18.54

72.07

¹ Static pressure is the difference in pressure from atmospheric pressure. Negative static pressure indicates that pressure is less than atmospheric pressure.