12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille 14" Round Duct Pipe actual front end outer dimensions

actual front end outer dimensions are approximately 27 5/8" width X 12 5/8" height

Actual Filter Size – 27 3/4"w x 11 3/4" x 1"

+ Product Details Size – 6" x 22" or 22" x 6" is the size for the duct opening measurement only

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Traditional HVAC systems were designed for cold air

12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille 14" Round Duct Pipe actual front end outer dimensions+ Product Details Size 12" x 18" or 18" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 19. 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