Trane Ductulator with Sleeve， Duct Sizing Calculator</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Multi-Color red， green， and blue</li><li>Includes a protective sleeve with ASHRAE recommended design air  velocities</li><li>Classic Ductulator  Style</li><li>One side English， one  side metric</li><li>Size ducts using the equal friction  method</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/51uygK83c6L.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51%2B1ybvMEkL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/31VhKttM7HL.jpg' noproxy></br>