Ducts Application Note
VESDA-E
35424_02
9
Figure 8: Manometer set-up for hole orientation adjustment
3.
Method 3 is the same as Method 2, except that it does not require the manometer but uses a clear,
flexible U-tube.
Step
Action
1
Instead of a manometer, connect the ends of inlet and exhaust pipes to a clear U-shaped
flexible tube containing water as shown (Figure 9), ensuring all connections are airtight.
2
Face the holes on both the inlet and exhaust pipes to the airflow. Slightly rotate the pipes
so that the water level on both sides of the flexible tube is the same.
3
Mark the position of the pipes’ orientation on the duct and pipes. This will make re-
positioning the pipes easy after maintenance checks in the future.
4
Connect the detector after securing the pipe network.
Figure 9: Flexible U-tube set-up for hole orientation adjustment
