Photo 1 of ****Partial set*** Therwen 6 Inch Round Vent Cover Ceiling Diffuser HVAC Vent Duct Cover Replacement with Steel Butterfly Damper Fitting in 6 Inch Duct, Outer Dimensions: 9-15/16"

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Photo 1 of ****Partial set*** Therwen 6 Inch Round Vent Cover Ceiling Diffuser HVAC Vent Duct Cover Replacement with Steel Butterfly Damper Fitting in 6 Inch Duct, Outer Dimensions: 9-15/16"Photo 2 of ****Partial set*** Therwen 6 Inch Round Vent Cover Ceiling Diffuser HVAC Vent Duct Cover Replacement with Steel Butterfly Damper Fitting in 6 Inch Duct, Outer Dimensions: 9-15/16"