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CI SqFt Radiation Sizing

wcs5050 Member Posts: 131
Trying to determine output. I’m using Burnham cast iron slenderized emitter chart as reference on these. 
6 column, 24” high, 26 sections, at 180degF I’m getting 10k-13k btu but am unsure on my chart understanding. Maybe someone has a better chart. 

Yes, that piece fired off the far radiator and no one has moved it. Someone had just entered the room as 6 others let go and said it sounded like a gunshot.