Alternative 1
AWE Grille can be connected to the ductwork using a plenum, with mineral wool as sound attenuation material.
Alternative 2
The grille can be connected to the ductwork using a balancing plenum, which comprises sound attenuation material of mineral wool or polyester fibre with a washable surface.
The plenum has an airflow measurement and adjustment unit. The grille is removable, in order to provide access to the measurement and adjustment module in the plenum.