Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
I am sizing a steam boiler for replacement and have found radiators that I am not familiar with - they are recessed cast iron - single row of tubes appr. 1" in diameter - the vents are located on the inside [between cabinet and radiation - you loosen a screw and lift out a small piece of blank tubes] - example:radiator is 23" high floor to top , tubes are 19" - radiator is 17" wide it has 9 tubes - I need to know a formula to determine square feet of steam required for this type of radiator.