This Metal Cone Vent is an internal vent that can be placed on your subfloor wall. The amount of airflow can be adjusted with the center piece of the vent to increase or decrease the restriction of airflow. The center circle is rotated clockwise or anti-clockwise to open or restrict airflow
These vents are a good product to use with your subfloor ventilation system to exhaust air through the subfloor internal wall.
