So, in the event of a screened-in porch where this exit is the required exit door, does the door leading from the home to the porch and the screen door leading from the porch to outside both need to meet the requirements for the exit door, or just the door from the house to the porch? Given the same example for a sunroom instead of a screened in porch, what rule applies? My perspective is that a door leading from the home to either an open or screened-in porch in this example would be the only door that has to meet exit door criteria, and that any confiquration of screen door leading from the porch is permissable. But, for a sunroom, the door leading from the sunroom to outside is the door considered to be the exit door.