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Leave the vents! The purpose is to ensure that the air circulation in the ceiling behind the ceiling will not make the wooden purlin moldy and damaged due to moisture!
If there is no central air conditioning or other use, there is no need to leave air outlets.
Generally, it is not left, because there are vents that will enter dust and foreign matter, but leaving vents can reduce the temperature of the ceiling and the indoor temperature.
Generally, it is not left, because there are vents that will enter dust and foreign objects, and leaving vents can reduce the temperature of the ceiling and the indoor temperature.
It is possible that rust indicates that the nail has broken down, and if it is serious, it will break because it cannot bear the weight, and it is best to replace the nail just in case.