They were not helping the BH but causing more big trouble inside the BH.
Yes I was referring to these redundant ventilation holes on the walls.
Each floor all the four walls were with two of this brick ventilation holes.
From what I can interprete is that the "Consultant" have not idea what he was trying to do.
He damaged the BH but allowing lots of light entering the nesting room.
The 4 inches PVC pipes ventilation holes were doing a good job but these bricks with a wide opening were a disaster.
Please think carefully before you allow such a mistake to happen in your BH.
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