When selecting a response control vane axial (VRD), what is the “TD Volume”?
A. CAPS displays a term that cannot be found in the vane axial brochure or performance manual. This term is TD Volume. TD Volume, or Turn Down Volume, is the lowest volume (or cfm) available when the blade pitch is turned down to its minimum on a response control vane axial fan. This information is extremely valuable to engineers who are designing a variable air volume system where the fan is required to provide a wide range of volumes. Q. Why do my sleeve lengths change in CAPS on certain line items? I want the sleeve size I entered. (This occurs when an OCI, TOR, RRL or combinations of these are selected). A. The sleeve length only extends when you have a height of less than 12 inches with a TOR, RRL, OCI option. Because the actuator has to be mounted horizontally due to the height constraint, the sleeve length must be extended. When this occurs, the TOR, RRL, OCI option must be mounted in the sleeve in front of the actuator. If we do not extend the sleeve, there is not enough room.
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