Fits 16x8 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 17.75"W X 9.75"H (16" W x 8" H Duct Opening) 6” wide by 5

6” wide by 5

and rafters

18" long heavy duty steel construction with matte black powder coating finish

and ceiling

and lay-in ceilings

Fits 16x8 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 17.75"W X 9.75"H (16" W x 8" H Duct Opening) 6” wide by 5The Listed size 16"x8" is for inside duct opening measurement, actual outside dimension is 17. 75"x9. 75" Stamped Face Steel Construction with 1 2" fin spacing for high air flow applications. Screws are included for easy installation White Powder coating with matte finish Individually packed with cardboard box for ultra protection