Starduct Return Air Grilles are made of extruded aluminum alloy grade A6063-T5. Free Area ~80% . Frame and blades are linked by aluminum pins of the same grade. Adjustable blades are parallel to the width of the grille with a 20mm gaps. 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.

The optional OBD: No plastic gears are used in the damper. Opposed blades of the damper are adjustable from the front of the grilles via lever or screw knob.

Powder coating finish in RAL9010 standard colors or optional color as requested with Jotun paint or equivalent, service life over 5 years

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.