CHARACTERISTICS: Industrial return grilles with fixed and 45° inclined bars 50 mm pitch. CONSTRUCTION: Galvanized steel. Models made of copper, stainless steel AISI 304, 2B or BA finish, are available on demand. UTILIZATION: For wall installation and for external air intake or exhaust air flow. FIXING: Fixing by using frontal screws. ACCESSORIES: • Calibration damper made of galvanized steel and fins with opposite movement. • Mounting counterframes made of galvanized steel sheet. • Bird screen. • Overpressure damper.