HV-RW is an outdoor air sampler. Dust was collected by OPEN FACE to analyze the mass concentration and composition of dust. High precision suction flow rate can be controlled through differential pressure detection, displaying instantaneous flow rate and cumulative flow rate on the screen. The constant flow device can control the decrease of suction flow due to the increase of dust intake. A conduit is installed to capture dust in the air. At the same time, shuttle tubes containing polyurethane foam were installed to capture dioxins. The HV-RW can be used in various conditions as a high flow and stable collection of hazardous substances in the air sampler.