Gravity Ventilators - Arrow United Industries The Arrow U.S.A. Gravity Ventilators are highly reliable, versatile and simple to operate. Designed to vacuum up any liquid or unwanted debris from air intake ducts, they can be used in a wide range of applications including but not limited to plenum control, dust extraction, heating and cooling (liquid trays), process cooling and exhaust systems. To Know More Visit Here: https://eldridgeusa.com/equipment/gravity-ventilators/