14" x 34" or 34" x 14" Cube Core Eggcrate Return Air Grille 18" Diameter + Product Description This aluminum

+ Product Description This aluminum flex duct is intended to be used in heating

Operating temperature from -40°f to +248°f [-40°c to +120°c]

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 20" duct openings

75" Width X 37

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 8" duct openings

14" x 34" or 34" x 14" Cube Core Eggcrate Return Air Grille 18" Diameter + Product Description This aluminum+ Product Details Size 14" x 34" or 34" x 14" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 75" X 35. 75". High Quality High quality, rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included); no sharp edges.. Installation Location sidewall and ceiling. Design Cubic core eggcrate design Offers highest airflow efficiency at almost 95%, reducing