Opposed Damper - OBSS

Opposed Blade Dampers

Opposed Blade Dampers

Opposed blade volume control dampers for grilles and diffusers has been designed to provide positive control of air. The range is constructed from high quality aluminium alloy extrusions and available for installation on the neck of grilles / diffusers, and also in the duct collars.

These dampers are available in anodised matte black finish for long life and non visibility. These dampers are key operated from the front face of grilles / diffusers.


  • Robust construction for lifelong service.
  • Smooth gear operation from front face of grilles / diffusers.
  • Black (matte) anodised for non visibility.
  • Blades are pretensioned with stainless steel spring wire.