How do you seal a french door?

To seal a French door, a person can purchase a weather stripping product that has a part in the middle that sticks up. One side is glued to the door and the other side is left free. The part that sticks up goes between the doors when they are shut to prevent drafts. The only draw back to this is that the person using the door has to remember which side opens first. Open the side that the weather stripping is glued to first.