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 31

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

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Traditional HVAC systems were designed for cold air

Filter grille features a user-friendly plastic latch that requires no screwdriver for opening

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