First fan was constantly on high power, which kept me awake, turned out they had recommended the wrong fan and eventually provided upgrade foc. The second fan regularly stops working. I have reported the current fault - sensor not working repeatedly. I keep being told to clean the fan, even if I have just cleaned the fan. So if you want an extractor which boosts when you pull the cord, you can choose either Wickes for £13.50, or envorovent for £ several hundred. Bargain! On the other had, to keep it simple, all you have to do is turn off your electric, dismantle the unit, vacuum it out and turn the electric nack on. Every time you want a shower or bath. Simples. I am beginning to wonder if Envirovent think that by not responding for two years, they can claim that the warranty has expired. Wrong!!