Quote:
Originally Posted by 70STOVEBOLT
Yes, but why cap off one side?
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The stock duct adapter with the two air inlets pointing at each other creates turbulence at the outlet reducing velocity, reducing airflow. Eliminating the air duct on one side reduces turbulence introduced by the air stream, but does not address the odd shaped adapter still messing with the airstream. The adapter I linked to further addresses the adapter by making it a coned shape. Ideally the single larger duct should go the vent. This would allow more volume with less air speed. Air speed would just increase at vent outlet. I have a design for my ideal adapter, just no way to make it.
I have over 40 years in the hvac business. Designed and installed air distribution systems (ducting) for custom homes, existing home retrofits and corrections and commercial applications. So my answer may have been to much.
Simple answer- to improve airflow