18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Grille 6" Round Duct Pipe + Product Details Size –

+ Product Details Size – 10"w X 22"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 32 5/8" width X 8 5/8" height -

+ Product Details Size - 24"w X 36"h X 2"d (for duct opening measurement only)

+ Product Details Size – 14"w X 24"h is the size for the duct opening measurement only

18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Grille 6" Round Duct Pipe + Product Details Size –+ Product Details Size 18" x 22" or 22" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 23. 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