Starduct Fresh Air Louver are made of extruded aluminum alloy grade A6063-T5. Free Area ~60% . The Z-shape blades for rain-proof are arranged evenly @ gaps of 40-50mm. When the grille width over 600mm, blades should be reinforced. All frame corners are reinfored by pressing special corner connectors for prevent them from twist and paint break
Powder coating finish in RAL9010 standard colors or optional color as requested with Jotun paint or equivalent, service life over 5 years
The anti-insects net available with powder coated
Production standards : Ashrea 70:2006. ASHRAE 70-2006 Standard “Method of Testing for Rating the Performance of Air Outlets and Inlets” ADC1062: GRD-84 “Test Code for Grilles, Registers and Diffusers”.
Scope of testing: A) Sound Power Level (NC) B) Air Volume versus Static Pressure C) Area Factor D) Throw Pattern