Very noisy when installed on plasterboard cavity wall. The noise in the next room is unbearable. No advice re best installation. When I received it I saw that the unit is shown installed on a solid wall. Also found that it was push button operated not...

I bought this and very disappointed. This item is not suitable for installation on a plasterboard cavity wall as I have done. It doesn't state that this product is unsuitable for cavity installation on product description. After I received the unit the...