Currently looking around too see if I can find the manufacturer. Mailed a couple of companies, and as it looks now it's from a manufacturer named Webasto (model Hollandia-100) which seems to be the correct one. In the mail it seemed to me(with my bad English knowledge that it was the correct one atleast 😅)
So will take a trip to the storrage and check in on it in the end of the week to check out if I can find some extra info which I might've overlooked when I first did a check on it.