Excellent product - great air flow and super quiet. I purchased this to replace an inferior product (fitted by the builder) that was just too noisy - particularly mounted just over the bedroom (supporting the en-suite ventiation) - I mounted this on a floating board in the roof held between the joists by the loft insulation - the result was it was inaudible virtually even stood right next to it - now I can continue sleeping when the wife gets up to baby sit.