Opposed Blade: Rectangular


 OPPOSED BLADE VS PARALLEL BLADE DAMPERS


OPPOSED BLADE DAMPERS  Blades Rotate in Opposite Directions
Best used in applications requiring Proportional Volume Air Control.
When Blades are partially open - Air is directed to the center of the duct.
This results in uniform air velocity and reduced air turbulence
PARALLEL BLADE DAMPERS   Blades Rotate in 1 Direction
Best solution for simple Open / Close applications.
When Blades are partically open - Air is diverted to the sides of the duct.
This results in non-uniform velocity. Airflow to branch ducts can be affected