To exempt from the application of Article 3.2.2.1., which relates to fire protection, certain exterior structural members that are effectively shielded from a fire inside the building, provided they are shielded from heat radiation in the event of a fire within the building by construction that will provide the same degree of protection that would be necessary if the member were located inside the building with the protection extending on either side of the member a distance equal to the projection of the member from the face of the wall.