Radiator frontal area chart

[Waterlogged]

Wouldn't that be more the radiators "volume" per se?

Isn't Area simply LxW?

-PB

Volume (in this context), would be what capacity it could hold in water, which isn't anywhere near the same amount as the surface area of the rad.

"Area" (as a term), is very generic, it can be both 2 dimensional and 3 dimensional. When you say surface area, it implies the area that the air will flow over, while frontal area implies that only the front part of the surface area is taken into consideration.