Architectural Grille 200063001 AG20 Series 6" x 30" Solid Aluminum Fixed Bar Supply/Return Air Vent Grille, Brushed Satin The AG20 Series: extruded solid recycled aluminum bars with weld-lock construction for maximum durability. These 'drop-in' bar grilles are easy to install and ideal for HVAC applications in residential/ commercial locations 45 Degree Deflection Easy 'drop-in' installation - no tools required Weld-Lock constructed for maximum durability Made of 90% post-consumer recycled solid aluminum Fixed bar/blades allow for maximum airflow Pencil Proof: 1/4" spacing between bars