The LoFlo Balometer® Capture Hood is the ideal way to measure very low volumetric flow. Measure (supply or return flows) confidently and accurately from 10 to 500 cfm (17 to 850 m3/h). This light weight instrument is great for residential or light commercial use. Easily observed trend values and fast meter response make the LoFlo Balometer® Capture Hood the preferred tool of residential air balancers.