I suppose that the more expensive ones have better electronics and motors, but as the duty cycles are quite low, I'm not sure that they really offer value for money. What that is saying is that I've bought from Greenwood and RDL who are both inexpensive suppliers and both extractors have run for 15 years plus.
One thing that I do advise is to go for humidstat extractors with a pull cord on to the timer as well. This enables extraction when the air moisture level gets too high, avoids the irritation of the fan coming unnecessarily when you switch the light on, but does allow you to blow out the smells when you need to.
JOOI is the humidity detection part available as a separate module for use with a fan / whatever? (i.e. a widget which has a humidity sensor and a relay* inside or whatnot)
Then widget could be wired in parallel with the 'override' switch and used with any old mains-powered fan... easy to replace anything that breaks without a huge expense.
Or something solid-state, so long as shorting it out when the override switch was on didn't upset it.
They seem such a lot more expensive than bathroom extractor fans. A good bathroom fan can be had for 60-100 pounds and OK the kitchen fan has a stainless steel collector and pipe and maybe a couple of lights but is that worth £400?
I am off to IKEA today to buy the kitchen cabinets and will look at the fans while I am there. Assuming I make it safely out the exit door I expect I shall be more knowledgeable by tomorrow
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