I could use some help calculating EDR on some convectors.

The system has Warren Webster written all over it. The recessed and self contained wall convectors are signature Warren Webster with the element on an angle with the 02H trap and supply valve built into it. The ones I'm having trouble figuring are the 1-1/4" fin tube. The fins have 1/4" spacing, there are 48 fins in 12" and they measure 4" x 4". In Dan's book page 263 the type matches the SA. If i look to the pcture showing a typical element, im only seeing this type element on the recessed and self contained units. Although I'm not sizing for a replacement boiler at this time, I would like to know the exact total Installed radiation.