I can't speak well for IEC, but in NEMA world it is TEBC, for Totally Enclosed Blower Cooled. I think the IEC designation might be Cooling Designation IC 416, because the 6 at the end means "machine mounted independent component", which I take to mean the cooling fan is independent of the motor shaft.
" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
Hi Lukin,
Is the load constant-torque (ie conveyor, crusher, constant displacement pump, etc) or variable-torque (ie centrifugal pump or fan)? If variable-torque, then a remote aux blower fan may not be required (ie you might get away with the standard shaft-driven fan; even with a turndown of 10:1).
GG
"I have not failed. I've just found 10,000 ways that won't work." Thomas Alva Edison (1847-1931)