most of them say something like "rated for continuous duty"...

i think they'll just start to wear down a little, they'll become louder than usual after a while... if they die, they're cheap, $15 bucks at home depot.
GreenEyesRed Reviewed by GreenEyesRed on . bathroom extractor fans is it possible to leave a bathroom extractor fan on ALL THE TIME? 24/7 24hours a week? or would it short out and burn my house down>? Rating: 5