12" X 6" [Duct Opening] 1-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 13.75"W X 7.75"H] 10" Round Duct Pipe With these options 4 X 12 Is CRFG2028 Width_14in

With these options

+ Product Details Size – 24" x 24" with 12" collar T-Bar drop ceiling perforated return grill - metal back casing

+ Product Details Size – 10"w X 24"h is the size for the duct opening measurement only

75" Width X 7

making it a reliable choice for improving indoor air quality

12" X 6" [Duct Opening] 1 Way Air Vent Adjustable Aluminum Curved Blades Integral Multi Shutter Damper HVAC Diffuser [Outer Dimensions: 13.75"W X 7.75"H] 10" Round Duct Pipe With these options 4 X 12 Is CRFG2028 Width_14in With these options + Product Details Size – 24" x 24" with 12" collar T Bar drop ceiling perforated return grill metal back casing