You can add a vent to the existing ductwork, but you'll need to make sure that it is properly sealed in order to avoid air leakage. You may also need to increase the size of the ducts in order for the new vent to function properly. Consult with a contractor or HVAC specialist to determine if this is feasible and how it should be done.

You can add a vent to the existing ductwork, but it's best to consult with an HVAC professional to make sure that you do it correctly. Adding a vent may not be the right solution if your problem is lack of airflow. Sometimes adding a vent just makes the problem worse by causing more air to flow through the existing ducts and create noise and drafts. In some cases, it may be necessary to replace the entire ductwork system.