Didn't see your edit - thanks for this.Many thanks again. I am also fairly positive it wouldn't be a product if it was an issue.
EDIT - For anyone else who has this question the answer is that it is not an issue. Fan headers supply 1 amp of power and case fans are in the 0.15 - 0.25 amp range so plugging 3-4 into a splitter is not going to overload the header