[Floridian]

Thanks for all the answers. I thought about replacing all of them with new vents but not there yet. I did went to Lowes and bought this weatherstrip:

https://www.lowes.com/pd/M-D-10-ft-Black...ip/1038917

We cleaned it up with denatured alcohol and carefully installed it. It lasted a single day, not sure if the sun hitting directly affected it or what but on the first rain (Florida summer rains are big) we went all proud to check our modification just to find that it was leaking even worst than before.

While we were there we removed that weatherstrip and used a different one (we replaced the window sealant on all windows) very similar to this one:

https://www.lowes.com/pd/M-D-13-ft-Expan...1000460601


we waited another day and went back expecting to be leaking and to our surprise it worked perfectly fine. Not sure how this will last but I'll call Steele Rubber Products and see if I can get the right replacement for it.