The concept of a storm door is very simple. It is a second, outer door commonly installed for protection against bad weather, and ventilation and light during beautiful weather.
However, a storm door is not simply a second entry door.
Most storm doors are equipped with interchangeable or retractable glass and screen panels. They are typically made with three layers: a front and back layer making up the exterior skin, and an interior layer of insulation.
In appearance and function, a storm door acts more like a screen door than an entry door
