At our site inspection we discussed the incident with Khun Apichat, he advised us that the technician found drain water from the AHU drain water clarifier flooded and flow along the pipe and dropped to the tenant product.
Khun Apichart informed us that may be caused by drainage ditches flooded. Therefore, the water cannot flow out of the pipe of AHU immediately.
While we inspection, we noted that the height in warehouse of about 7 meters where we opinion that the water in a ditch overflown is not likely to affect the flow of drain water of AHU.
We expected that there may be something stuck inside the main drainage pipe. As a result, the water flowing slowly until flooded the AHU drain water clarifier.