You fans will have timers in them. You can either turn the timer down to just a few seconds after the light is switched off or so that they turn off straight away.
However the usual reason that the fans are there is that they are required by Building Regs and so you should not turn them off completely.
If it was me I would leave them run for say 20 seconds or so after someone had turned the light off. How would your neighbour know that they were not going off instantly? :-)
If they still moan, you may want to share the Building Regulations requirement with them and say that your hands are tied.
T
August 2009