I don’t remember if I did but I can tell you that the performance I am getting from them is more than adequate. Cooling has not been an issue at all which I can measure and continuously monitor for some of these with the printer’s built in sensors. Basically for something like this use case the point isn’t to make it as cool as possible but cool enough to work correctly which these fans are more than able to do all day long at a volume level that is inaudible to me.