The TSI Alnor RVA air cone flow hood kit provides a fast and accurate method of maximizing the usefulness of the TSI Alnor rotating vane anemometers by turning them into air volume flow balancing tools. This TSI Alnor kit includes an 11.2" x 9.2" rectangular cone and a 7.1" diameter round cone. Generally used for measuring volumetric flow at grilles and diffusers, these air cones have a range of 0 to 210 cfm (0 to 0.1 m3/s).