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Appendix C: Exponent Errors

If a gauge is set to an exponent value (“n”) but the actual exponent (the true exponent value that is

supposed to be entered for the building) differs, an error will result. The tables below show the

percent error that can result from entering an incorrect exponent value.

Table 14. If the “n” value on the DM-2 is set to 0.65 and the building “n” is different, a small error, as shown in the table,

will result.

Actual Flow Exponent (n) of Building

0.50

0.55

0.60

0.65

0.70

0.75

Achieved

Building

Pressure (Pa)

-21.4%

-14.9%

-7.7%

0.0%

8.4%

17.5%

-16.5%

-11.3%

-5.8%

0.0%

6.2%

12.8%

-12.8%

-8.8%

-4.5%

0.0%

4.7%

9.6%

-9.9%

-6.7%

-3.4%

0.0%

3.5%

7.2%

-7.4%

-5.0%

-2.5%

0.0%

2.6%

5.2%

-5.2%

-3.5%

-1.8%

0.0%

1.8%

3.6%

-3.3%

-2.2%

-1.1%

0.0%

1.1%

2.3%

-1.6%

-1.0%

-0.5%

0.0%

0.5%

1.1%

0.0%

1.4%

1.0%

0.5%

0.0%

-0.5%

-0.9%

2.8%

1.8%

0.9%

0.0%

-0.9%

-1.8%

4.0%

2.7%

1.3%

0.0%

-1.3%

-2.6%

5.2%

3.4%

1.7%

0.0%

-1.7%

-3.3%

Table 15. If the “n” value on the DM-2 is set to 0.60 and the building “n” is different, a small error, as shown in the table,

will result.

Actual Flow Exponent (n) of Building

0.50

0.55

0.60

0.65

0.70

0.75

Achieved

Building

Pressure (Pa)

-14.9%

-7.7%

0.0%

8.4%

17.5%

27.3%

-11.3%

-5.8%

0.0%

6.2%

12.8%

19.8%

-8.8%

-4.5%

0.0%

4.7%

9.6%

14.7%

-6.7%

-3.4%

0.0%

3.5%

7.2%

11.0%

-5.0%

-2.5%

0.0%

2.6%

5.2%

8.0%

-3.5%

-1.8%

0.0%

1.8%

3.6%

5.5%

-2.2%

-1.1%

0.0%

1.1%

2.3%

3.4%

-1.0%

-0.5%

0.0%

0.5%

1.1%

1.6%

0.0%

1.0%

0.5%

0.0%

-0.5%

-0.9%

-1.4%

1.8%

0.9%

0.0%

-0.9%

-1.8%

-2.7%

2.7%

1.3%

0.0%

-1.3%

-2.6%

-3.9%

3.4%

1.7%

0.0%

-1.7%

-3.3%

-4.9%

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