Acoustic transfer grill NL

WITH SOUND REDUCTION CHARACTERISTICS Acoustic louvres as a protection of air conditioning systems against the direct ingress of rain, leaves and birds into fresh air and exhaust air openings Maximum width of 1800 mm, maximum height of 2250 mm Low differential pressure due to aerofoil blades Low air-regenerated noise All aerodynamic data is measured in aerodynamics and acoustics laboratories Absorption material faced with glass fibre fabric and retained by perforated sheet metal Double bank of louvre blades for demanding acoustic requirements Non-active section, without acoustic function, for a uniform appearance Multi-section constructions for large dimensions Optional equipment and accessories Powder-coated Application Acoustic louvres of Type NL for the fresh air and exhaust air openings of air conditioning systems Protection against the direct ingress of rain as well as against leaves and birds Recommended face velocity for fresh air openings: 2 – 2.5 m/s max. Weather and noise protection with a compact-depth unit Special characteristics Two construction depths for normal and demanding acoustic requirements Aerofoil blades Absorption material retained by perforated sheet metal Nominal sizes B: 300, 450, 600, 750, 900, 1050, 1200, 1350, 1500, 1650, 1800 mm Width subdivided: 1950, 2100, 2250, 2400, 2550, 2700, 2850, 3000, 3150, 3300, 3450, 3600 mm H: 450, 600, 750, 900, 1050, 1200, 1350, 1500, 1650, 1800, 1950, 2100, 2250 mm Height subdivided: 2400, 2550, 2700, 2850, 3000, 3150, 3300, 3450, 3600, 3750, 3900, 4050, 4200, 4350, 4500 mm Any combination of B × H Other dimensions upon request