The exterior walls, doors and windows are the protective shell of a home. If a home's protective shell is broken, high winds can enter and put pressure on the roof and walls, causing damage. Strengthening the doors and windows can protect a home.
Most double doors have an active and an inactive or fixed door.
Check to see how the fixed door is secured at the top and bottom. The bolts or pins that secure most doors are not strong enough. Some door manufacturers provide reinforcing bolt kits made specifically for their doors. Check with a building supply store to find out what type of bolt system will work. Doors with windows will need additional protection from flying debris.