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In this lesson you will modify existing ductwork and then use the Connect Into Tool to connect components to the existing Air System. You will also convert Rigid Duct into specified lengths of Flex Duct. Click the Menu Browser and select Open and from the Training Files, Imperial, Mechanical Systems folder open the file RME - Mech - Air Systems - 05. If the System Browser is open close it and zoom in to the lower left corner of the building. Select the Heat Pump and right-click the Supply Air Connector facing the room's double doors and click Draw Duct. Click the Change Element Type drop-down and select Mitered Elbows - Beveled Taps. Press the Spacebar to make the new duct match the Heat Pump Duct size and location then click midway between the top two light fixtures, then move your cursor down and click a point just below the lowest set of Diffusers, then press Escape twice to end the command. To begin Branch Duct select the top right Diffuser, right-click the Connector grip and click Draw Duct. Then click Change Element Type and select Mitered Elbows and Taps and on the Options Bar for Offset select 9 feet 10 and a half inches. Then click the intersection of the Branch Duct and the Main Duct, then click Modify, then in the Project Browser under MEP Design, 3D Views, double-click Level 1 - 3D MEP. Then on the View Cube click the top southwest corner, then zoom in to the lower left corner of the building, then tile the windows by using WT so that you can view results in 3D as you add duct in 2D. Make the Floor Plan view active and select the top unconnected Supply Diffuser, then click Connect Into and then select the Main Supply Duct. Using the same method connect the remaining Diffusers to the Main Duct. Next, from the Home tab's HVAC Panel click Convert Flex Duct and select the top left Diffuser. When you do, a portion of the rigid Ductwork is converted to Flex Duct. Select the remaining Diffusers then press Escape. Next, from the HVAC Panel click Duct Fitting, then click Change Element Type and select Rectangular Endcap Standard. Click the endpoint snap of the Main Duct and press Escape twice. Next, click the Modify tab and from the Edit Panel click Split. Then click on the Main Duct below the top set of Diffusers as shown. Click Modify, then place your cursor on a section of the Main Duct and press Tab to highlight the entire Main Duct run and click to select it. Then click Duct Pipe Sizing and make sure that Restrict Height is cleared and click OK. When you do, the ductwork is sized to provide appropriate CFM Value for the system. The Height Constraint is used when you place Duct in a restricted space such as a Plenum. Close the file without saving it as the next lesson will provide its own training file and that concludes this lesson.