Here you will find all Grada perforated ceiling diffusers with side entry spigot with uninsulated plenum and adjustable extract air! Because of the length and width of 594mm, these diffusers are suitable for a 600x600 suspended ceiling. The extraction of air is adjustable via the four separate dampers! The ceiling diffusers have a side entry spigot with uninsulated plenum and are available in different diameters. This means that a diffuser is available for all ducts. The perforated ceiling diffusers have a panel perforation of approximately 51% and are made of steel. Still looking for another diffuser? Then take a look at our full range of ventilation grilles!