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 + Product Details Perfect Fit RG2230 HP w4h4 const modal document

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

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+ Product Details Size & Compatibility – The size of the side round ceiling box is 6" X 6" X 6" and it is compatible with duct 6"

+ Product Details Size - 34"w X 8"h is the size for the duct opening measurement only

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

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 + Product Details Perfect Fit RG2230 HP w4h4 const modal document + Product Details Perfect Fit & Easy Sizing Designed for a 26" x 34" OR 34" x 26" duct opening (measured at the opening) font weight: bold