12" X 18" Or 18" X 12" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 13.75 X 19.75] Compatible With Duct 7in Insulation – A thick blanket AD-S-230-10x10 Actual Filter Size 25 Width_8in

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

+ Product Description Introducing our 8" x 16" or 16" x 8" Floor Grille - a reliable and durable air grill designed for exceptional performance and built to last

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 34" OR 34" x 26" duct opening (measured at the opening)

+ Product Details Size – 16"w X 30"h is the size for the duct opening measurement only

12" X 18" Or 18" X 12" Heavy Duty Floor Grille Fixed Blades Air Grille Brown [Outer Dimensions: 13.75 X 19.75] Compatible With Duct 7in Insulation – A thick blanket AD S 230 10x10 Actual Filter Size 25 Width_8in Insulation – A thick blanket of fiberglass insulation provides you with an R Value of 4 + Product Description Introducing our 8" x 16" or 16" x 8" Floor Grille a reliable and durable air grill designed for exceptional performance and built to last