(Airflow Direction Into or Out of Room)
Great for Animal Facilities or Rooms that may be frequently switched between negative and positive pressure modes. The ADI-69-V-CURVE is a curved tube and not a straight tube like the dedicated room models or the N/P model. The tube is curved with the low point at the bottom of the tube which is located in the wall. The unit uses one yellow ball. The failsafe position of the ball is in the wall. Therefore, when the door is opened to the room, the ball falls out of sight into the wall, unlike the N/P and dedicated negative or positive models where the ball falls to the other side of the wall.
Labels: This model comes with three labels shown on the left. The end-user can choose whether to use the yellow adhesive label or the two magnetic backed labels. All three labels indicate to the staff how the airflow direction indicator operates. The yellow label is typically used when the end-user has their own signage to indicate the desired room pressure mode. The two magnetic backed labels can be used instead of the yellow label. The end-user mounts either the negative or the positive label, depending on the desired room pressure mode. The label indicates to the staff which pressure mode the room is supposed to be in.
Comparing this model to the Manually Switchable N/P Model:
Advantages: There is no need to manually change the tube or the ball each time the room pressure mode changes.
Possible Disadvantages: The ability to see the ball from the other side of the wall in a failed mode. For example, if the room is in negative mode and the room pressure is neutral, the ball will be in the wall and not in the corridor. In other words, you may not know the room is not properly negative until you actually enter the room and see it is not in the room with the door closed. However, once you are in the room, you can open and close the door and see the failsafe mode checking.
Overall, this is a great unit for rooms that are frequently switched and there is no desire to manually switch the indicator each time the room pressure mode is switched...