Does it have a channel in the frame to take one of the P, E or I types of seal?
You need to know the height of the gap you are trying to seal and then the width of the channel to locate the seal.
You can then simply select the right type to suit.
If you don’t have a channel you are most likely looking at a foam seal you can stick around the frame.
I hope this is some help but yes it is a ridiculous question as it should be self explanatory