Fitted a 100mm SELV Xpelair Silavent fan a month or two ago. Client says it is running all the time. I said I think it is designed to do so but am now not so sure.
I thought initially that the fan would sit there awaiting a rise in hunidity before kicking in and doing its thing until the levels returned to below the humidistat trigger threshold, then I looked again and it seems that the fan runs all the time on a slow speed until a higher humidity level triggers the sensor and then the fan speeds up.
She's annoyed with the noise of the fan running all the time and is switching it off at the isolator until needed.
So, just how are these things supposed to actually work?
