I recently purchased my house which was a new construction. Several of the vents are getting poor airflow but the installation company simply said it was normal but I suspect otherwise. I recently realized there is a branch duct coming out of the end of the trunk line and I've read this can reduce airflow.
Does anyone have any suggestions or guidance on how to fix this? I was considering extending the trunk line another 3-4 feet and moving the end duct to the side like the others.