External exhaust fan kit extra port used for what?

Did anyone ever use the extra port on the Exhaust fan kit for connecting another device (like the tpu feeding assist module or a timelaps camera)?
im getting mixed answers about this topic

The AI says that you can connect additional devices to the exhaust fan kit and that the second port is meant for that

The support team says this second port is a spare port in case the first one breaks

does anyone have experience on this matter?