I've had a Flat master for a few years . Sadly just out of warranty. Easy to install and quiet but quite expensive especially when it stopped working and on inspection of the workings it's a very simple low consumption fan with a transformer. Something on the circuit board had blown and Nuaire doesn't supply replacements. My main problem is that given the components, this is hugely over priced. 20 v fan and transformer in a box basically.
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