Product review (5 stars): For me, it does what it's suppose to do: redirecting the air flow of a covered vent
I needed to reroute the airflow from an HVAC vent on the wall to flow away from a large cabinet I had placed in front of the vent. The Extend-A-Vent did exactly what I needed it to do, redirect the airflow for cooling and heating that area of the house. It changed what would have been a useless, covered/blocked vent into a useful one providing cooled or heated air to the area.