1 Breakages are less as the boards are much tougher and have fibers reinforcing in them. 2  they damage less easy from general wear and tear in everyday use in a home or office. 3  It offers slightly better acoustics than standard board.  It is a superior product in case of fire.
It is normal for the solenoid to make noise, it clicks when the valve is turned on or off. It also is normal for a very soft buzzing sound to be heard when the valve is activated, but you should not be able to hear it unless you put your ear near it. If you can easily hear it buzzing, that is not normal.
If your humidifier is not getting water from the solenoid, assuming you have the water tap open, either the solenoid or the humidistat is bad. Itâs much more common for the solenoid valve to fail over time and get stuck shut and not open, even when the humidistat is allowing voltage to the solenoid.