Shoemaker 945-12X8 12"x8" 4-Way Adjustable Diffuser - White 945 O - Steel Lever Operated Opposed Blade Damper Vertical and Horizontal Air Deflectors With Nylon Bushings For Easy Adjustment And Quiet Settings Adjustable Steel Blades With Steel Multi-Shutter Damper All Component Parts, Rivets, Linkage And Handle Enclosed In Valve To Assure Trouble-Free Operation