bathroom fan

[vw754]

[b]hi,im after a fan for the bathroom that is 6" 150mm or bigger,no pull cord,auto....i want it to come on when the bathroom light is switched on and i want the fan to continue running after the light is switched off so would need a timed one.

Also which is better in power as i have a shower and it get very steamed up,so should i be looking at wattage or something else...bathroom is around 6 x 6 ft[/b]