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Steam Convector

Good Afternoon,
I visited a jobsite today to size the steam radiation for a replacement boiler. The first floor of the home has steam convectors recessed into the floor. The convector element consists of 2 rows of 10 finned cast iron tubes (20 tubes total). The tubes are 4" in diameter and are 28" long. The element is suspended beneath a grate in the floor, and it is enclosed in a sheet metal box that measures 38" long x 28" wide x 30" high. There is a 8" x 10" door in the bottom of the box that slides open or closed, and there are no other louvers in the enclosure. I am not sure how to calculate the sqft of radiation for this convector. Any thoughts?


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