16" X 18" or 18" x 16" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 17.75 X 19.75] Oval Stack Head compatible with duct 5" | Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

compatible with duct 5" | 10 in a pack - 5 inch diameter pipe – 20-foot length when connected – 30 gauge thick & made of thick & durable galvanized sheet metal

actual front end outer dimensions are 9

+ Product Details Size - 12"w X 30"h is the size for the duct opening measurement only

height: 14px

+ Product Details Size – 28"w X 20"h is the size for the duct opening measurement only

16" X 18" or 18" x 16" Heavy Duty Floor Grille Fixed Blades Air Grille Brown [Outer Dimensions: 17.75 X 19.75] Oval Stack Head compatible with duct 5" Compatible With Duct 7in Applications This sheet metal DDAG A 1212 compatible with duct 5" 10 in a pack 5 inch diameter pipe – 20 foot length when connected – 30 gauge thick & made of thick & durable galvanized sheet metal actual front end outer dimensions are 9