Hospital center suction What does it mean

Hospital center attraction, by the center of the attraction station, piping, valves and terminals, etc.: attraction system negative pressure source is the center of the attraction station of the vacuum pump unit, through the vacuum pump unit of the suction attraction system piping to achieve the required negative pressure value, in the operating room, resuscitation room, treatment room and various wards of the end of the attraction, to provide medical care to use. This is the owner's intention!