Page 62 of 91
© Retrotec 2017
Device [1000, 2000, 3000]
1000
1000
1000
1000
1000
1000
1000
Range, [C4, C2, C1]
C1
C1
C1
C1
C1
C1
C1
Time averaging, seconds
4
4
4
4
4
4
4
Actual leakage area as measured,
8 sq in
12 sq in
16 sq in
20 sq in
24 sq in
28 sq in
32 sq in
Press [Set Pressure]
60Pa
60Pa
60Pa
60Pa
60Pa
60Pa
60Pa
Read peak pressure from gauge
92Pa
83Pa
71Pa
60Pa
60Pa
60Pa
60Pa
Read peak % speed from gauge
34%
33%
32%
37%
49%
61%
76%
Read final % speed from gauge
15%
18%
27%
37%
49%
61%
76%
If you believe you have a more severe problem with overshoot, fill out the table below and send it to tech-
support.
Device [1000, 2000, 3000]
Range, [C4, C2, C1]
Time averaging, seconds
Actual leakage area as measured,
Press [Set Pressure]
Read peak pressure from gauge
Read peak % speed from gauge
Read final % speed from gauge
Set the correct Device on your gauge because it will calculate different results depending on which Device
is selected.
8.12
Check if large fixed errors are caused by pinched tubes
A pinched pressure tube can create a very high reading on the gauge, which is erroneous. In other cases, a
pinched tube will prevent the pressure measurement from reaching the gauge at all. In cases where tubes
get stepped on, they are seldom sealed off completely, but will still cause the gauge readings to jump
around.
Figure 68: Errors in pressure reading from a pinched tube.
It is possible to complete a Blower Door test with a pinched tube. It will appear as if the fan is creating a
pressure in the building, but in fact the results are way off. If the gauge begins to display an unusually high
or unexplained pressure, check the tubing to ensure that it has not been compressed in any way.
