6"W X 16"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 7.75"W X 17.75"H] Material_Steel 75" Deep - Will Fit Suitable for all AC 8in diameter 12125SDCLNGBX

75" Deep - Will Fit All Garrage Doors - Insulated And Non Insulated Garrage Doors [The Hole In The Door SHould Be: 15 ¼ x 9 ¾]

positioning supply and return grills accordingly

Noise free components - no vibrating louvers etc

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 20" OR 20" x 36" duct opening (measured at the opening)

6"W X 16"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 7.75"W X 17.75"H] Material_Steel 75" Deep Will Fit Suitable for all AC 8in diameter 12125SDCLNGBX 75" Deep Will Fit All Garrage Doors Insulated And Non Insulated Garrage Doors [The Hole In The Door SHould Be: 15 ¼ x 9 ¾] positioning supply and return grills accordingly