Slotted linear diffusers SGID, SGID 1, SGID 2 are used in supply and exhaust ventilation and air conditioning systems and are designed for installation in ducts or building openings of premises of various types and purposes. SGID diffusers equipped with rotary louvres for air direction control are used for supplying air to the rooms. SGID 1, SGID 2 diffusers are more appropriate for removing air from the room. The grilles are made of aluminium profile with the number of slits from 1 to 6. The role of air flow control is performed by movable perforated plates. Each diffuser of SGID series can act as an independent complete product or as a part of a sectional grille. Diffuser SGID 1 is manufactured without swivelling louvres (mainly used for air removal). Diffuser SGID 2 is manufactured without swivelling louvres and moving plates (used in systems that do not require regulation). The protective and decorative coating is polyester powder paint. Standard coating colour white RAL 9016 is not specified when ordering (painting in any other colour according to the RAL colour catalogue is possible). Swivelling louvres and perforations are painted black. SGID diffusers can be equipped with an adapter for duct connection. Adapters are available with either lateral or axial connection to circular or rectangular ducting. The range of diffusers in this series includes standard sizes, and any size can be manufactured in 1 mm increments.