12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Grille 18" Round Duct Pipe the actual front end outer

the actual front end outer dimensions are 6" in diameter

actual front end outer dimensions are approximately 28 5/8" width X 26 5/8" height

+ Product Details Size - 18"w X 24"h is the size for the duct opening measurement only

High Quality Aluminum – The premium durable aluminum will never rust and it will never wear through leaving the material with an elegant

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12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Grille 18" Round Duct Pipe the actual front end outer+ Product Details Size 12" x 26" or 26" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 27. 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