Thanks for the quick response, I have asked Antec via their support mail and they gave me a short unhelpful response,ie connect them to the PSU.
My motherboard ASUS M4A785D-M PRO has two connections for fan control,one for the PSU fan and one for the case fan. However the case fans only have a large peripheral power plug and the PSU does not have a plug for connection to the motherboard? (Antec Earthwatts 500 watt PSU installed) Unfortunatly Antec make good cases but their manual is useless and does not even explain what the miriad of cables are for, but I can see their is no connection for the motherboard fan control.
The two case fans have a further connection going to a speed control switch on the case rear, but this will not shut them down. My only thought is does the Antec PSU have the ability to cut the power to the fans when the PC is shut down? It does appear to have various electronics to control input and outputn but once again the manual is next to useless.