Number of columns in radiator

heck23

I apologize in advance if this seems like a stupid question to anyone. I have a few column type radiators in my house like the one in the attached picture, I am unsure if the smaller center section is considered a full column when determining the EDR of the radiator. It is hollow and carries steam (vent is in a tapping on the other side)

Abracadabra

I'd consider it a 3 column. maybe a 2.5 if you want to get picky, but the 2 outside columns are a good side so I'd go with 3.

Fred

I agree with Abracadabra, it's a 3 column.

heck23

Thank you both very much. Was very helpful.