I had to seperate a utility transformer from a generator outside with a block wall that was at least 45 degree it height from highest point of the transformer. These were poco specs. though.
Heres a generator room we had in a basement of a high rise everything is emergency all the transfer switches on one wall all the transformers on one wall enclosed in a 4 hour rated room .
But the funny part was after they built it some engineer designed a air vent in the wall so it defeated the 4 hour rating .
The generator intake was seperately fed by air duck to the out side along with the dual exhaust outside .
Well no iam surprised you asked that question Kohler doesnt make General Electric equipment ?
The generator and the transfer switches are from kohler all our electrical panels and transformers are from us we supply these like a normal job we install the generator and the transfer switches and the gear panels and equipment as a normal electrical contractor .