a rain pan that is rusted out. Rain pans are for wooded or sided chimneys only. The pan encases the top of the chimney pipe and seals around the pipe with slants to give the water... a runaway from the chimney opening. There is no such thing as a standard rain pan - they have to be custom made. Shroud A decorative piece that goes on top of the rain pan. (See Left...) Chimney Cap or Top Contains no rain pan or shroud hood. Functional and decorative. ONLY for brick chimneys. The chimney caps are custom made to fit each individual chimney...