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.
click hereYou have 3 open access pages. Loud second heart sounds can be loud A2 or a loud P2. 1  loud A2 occurs in systemic hypertension where there is a dilated proximal aorta. 2  a loud P2 is heard in pulmonary hypertension. 3  a loud P2 occurs in an atrial septal defect without pulmonary hypertension.