DBK
LIFE MEMBER
You have a socket problem not a plug problem. I wouldn't dream of using a "doubler" on something like a fan which can use a lot of current on high settings.I connected mine through a socket doubler with a coolbox initially, the socket doubler was fused, the fan was only on speed 1 and seemed fine so I thought all was well, although I was a little concerned about the load.
Unbeknown to me one of the kids fiddled with it whilst I was driving, put it on speed 3. I thought I could smell a bit of a hot plastic smell - then I got the "Dad, the fans stopped working" - I stopped and the plug on the doubler had melted, fuse still intact! Luckily the fan, coolbox and socket were all fine
Is this the basis of your assertion the EB fan is poorly made? If it is I suggest it is a (small) user induced problem.