How To Install Ductwork Design In Attic
The layout and installation of the duct system will incorporate these basic principles of good ductwork design.
How to install ductwork design in attic. When hvac ducts are installed in a vented attic in a dry climate bury the ducts in attic insulation to protect them from temperature extremes in the unconditioned attic space. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. Use metal flex or fiber board ducts that are insulated to code. The duct insulation should include a vapor barrier cover.
Proper planning for the path and placement of the duct trunks and branches in attics during the mechanical design phase as well as during installation is a recommended practice to avoid crimping. Use a draw band connector to complete the butt joint. Additional considerations need to be given to all components in particular ducts that are installed in floor joist bays and wall chases. Overlap one side as you normally would and create a butt joint on the other.
Make the layout as symmetrical as possible with branch ducts spaced evenly along the trunk duct and each branch of similar length. Situate the air handler close to the center of the layout to minimize the length of ductwork spans.