E-DRA: Circular diffuser with fixed vanes inclined at 18º, causing a rotational effect.

E-DRA+CR: Circular diffuser with fixed vanes inclined at 18º, with butterfly-type flow regulation gate.

E-DRA+CR+PM: Circular diffuser with fixed vanes inclined at 18º, with regulation gate and mounting bridge.

E-DRA+XAPO: Circular diffuser with fixed vanes inclined at 18º, with special bridge collar with regulation for direct adaptation to flexible duct.