18" x 28" or 28" x 18" Cube Core Eggcrate Return Air Grille white actual front end outer dimensions

actual front end outer dimensions are approximately 30 5/8" width X 38 5/8" height

please note that the total outer dimensions of the grille measure 7" in diameter

Installation of the vents will eliminate the need to raise the door ensuring security and constant air flow and reduced heat transfer into attics and adjacent house walls

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+ Product Details Size – 16"w X 20"h is the size for the duct opening measurement only

18" x 28" or 28" x 18" Cube Core Eggcrate Return Air Grille white actual front end outer dimensions+ Product Details Size 18" x 28" or 28" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 29. 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