6" x 6" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 4-Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 9" x 9"] d High Quality – Easy unrestricted Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

High Quality – Easy unrestricted airflow for your HVAC system - 7/8" margin turnback

Do not measure the overall grille for sizing

75" Width X 15

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 28" or 28" x 12" duct opening (measured at the opening)

Rule of Thumb: "HVAC" nominal tube sizing 1/8

6" x 6" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 4 Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 9" x 9"] d High Quality – Easy unrestricted Compatible With Duct 7in Applications This sheet metal DDAG A 1212 High Quality – Easy unrestricted airflow for your HVAC system 7 8" margin turnback Do not measure the overall grille for sizing