This link opens up a PDF booklet by American Radiator Co. on their cast iron wall radiators. These are usually found in homes in garages, basement ceilings, or many times in small bathrooms. In commercial applications they are everywhere. These cast iron radiators are no longer made and every effort to save or salvage them should be made. After all, when something isn't made anymore it takes the status of antique. This booklet shows everything one would need to know about the assembly, dimensions, ratings, uses of cast iron wall radiators. If there is something you want to know about cast iron wall radiators its in here. Give the PDF time to open, it is 60 pages of cool information. If you have a cast iron wall radiator that needs replacing, there are steel models still made but they will heat different from the cast iron models.