CHARACTERISTICS: Industrial return grilles with fixed and 45° inclined bars 60 mm pitch. CONSTRUCTION: Anodized aluminium. UTILIZATION: For wall installation and for external air intake or exhaust air flow. FIXING: Fixing by clips or frontal screws on request. ACCESSORIES: • Calibration damper made of galvanized steel and fins with opposite movement. • Mounting counterframes made of galvanized steel sheet. • Bird screen. • Overpressure damper.