identify steam radiator

Ed B.

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.

                                                       Thanks,Ed

jpf321

picture? brand markings?

a picture would really help .. brand markings would be even better. 

Charlie from wmass

Are they Arco convectors?

If so a search will bring up another post with the ratings.