If you have a tank query and you can't find the answer anywhere else, post here. (TIP - Check for answers in FAQ, use the 'search' facility or even check this board before posting here).
Forum rules
If your question is electronics related please post it in one of the relevant boards here: viewforum.php?f=31
Might be two ways of finding out, until someone gives you a better answer then mine. Email them, or just take a volt ohmeter, unplug the fan, and measure the voltage you get there.