Install air ducts conditioning is a critical step that will determine how well it is cooled your home by the system. Making sure that the airflow is efficient, airtight and will circulate less stress on your air conditioning unit, reducing bills energy and cooling the house at a higher overall level.

Each state has specific codes and regulations on how to install air conditioning ducts; You should also consult the American Association of Air Conditioning Contractors (ACCA) manuals D, J, and S for more information on installation.


  1. Carry out the charge calculation. This is to determine the heat gain and loss for each room in the house, and can be done with an online charge calculator. Then use it to measure and plan the size and location of each duct, using the duct tape.
  2. Plan where to place the various parts of the duct system. This is to find the most appropriate location for the fan coil unit, followed by the air return duct and the filter. The coil unit can be placed in the attic, the garage or a hole, as well as a closet, utility room or other enclosed space. The air return duct should not be located in the dining room, living room, or kitchen.
  3. Wear glasses, gloves, helmet and mask.
  4. Cut holes for the return air duct opening. Pass the fan coil through this opening.
  5. Construct a structure to secure the fan coil unit. This can be done by constructing a simple wooden platform to join the coil unit, or by constructing a suspension platform using 1/4 inch (0.6 cm) threaded rods. See the instruction manual that comes with the fan coil for special instructions for this step.
  6. Attach the ring seal to the fan coil cabinet. Then connect the supply ring to the platform, using four screws over the opening of the platform; should be 4 inches (10 cm) below the fan coil unit.
  7. Connect the plenum duct to the air conditioning unit. Cut the male end of the first section and insert the conduit into the receiver ring onto the fan coil to form a tight joint; then flatten the tabs of the metal sheet against the plenum duct unit and insert the flathead pins. Assemble the remaining “flap” conduit joints using the steps above. Place the end cap of the plenum over the top extension; This is done by collecting the flanges of the metal foil at the end of the plug with flat head pins. Put tape here with a cross section.
  8. Cut the supply lines per the size determined in the extension plan above; Then removes the sheath and core insulation. Slide at least 1 inch (2.5 cm) of core over the ring; Put at least two layers of tape in the core. Secure with a clamp. Install a connector on the remaining open end of the supply conduits by screwing it into the latter by following the previous steps above. Connects the conduits to the connector using a turning action; Then connects and joins the conduits following the planned extension above, using the T-metal sheets and the rings; Connect the ducts to the beams / roof with T-blades (if attached to beams) or flanges and / or hangers (if attached to the ceiling) at intervals not greater than 5 feet.
  9. Cut a 2-inch (5 cm) hole into the plenum at a 20-degree angle, looking down. Join the plenum seals around this hole; Place plenum socket connector in this hole. Insert plenum seals with pliers.
  10. Attach the air return box to the cut-off opening above. Using the four screws, attach the frame to the long side of the box. Then insert the air return grille into the box with the four screws provided for this purpose. Insert the filter into the grille.
  11. Cut the return air ducts following the instructions in Step 7. Connect one end of the return conduits to the elliptical end of the fan coil and the other end to the air return box connectors with the band clamps.
  12. Test that the duct installation is correct by starting the air conditioning system and checking for leaks in the ducts if the desired temperature and air pressure levels are reached. Check with your state government website to see the required testing procedures and make sure your system passes them successfully.