Hi Silvana,
I don't know of a specific ventilator certification but that doesn't mean that it isn't out there. Did you ask the inteviewer where their nurses received this training? It sounds like something that they might have designed or possibly worked with a homestudy program to offer inside. I developed one for my own facility and it is used for ICU annual competency and new hire orientation. Before becoming an RN, I was an RRT.