CHARACTERISTICS: Grilles for circular ducts 20 mm pitch. CONSTRUCTION: Galvanized steel, or painted in RAL 9010, RAL 9016. Models made of stainless steel AISI 304, 2B or BA finish, are available on demand. UTILIZATION: For circular duct installation, and for air intake and delivery. Installation height: 2,5-3,5 m. FIXING: Fixing by frontal screws. Accessories: • Calibration damper made of galvanized steel and fins with opposite movement. • Getting damper. • Single blade deflecting damper.