8" x 18" or 18" x 8" Cube Core Eggcrate Return Air Grille Black + Product Details Size –

+ Product Details Size – 32"w X 25"h is the size for the duct opening measurement only

Can be hooked up with our Butterfly Dampersfor precise airflow control

+ Product Details Size - 22"w X 34"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 12 5/8" width X 20 5/8" height

8" x 18" or 18" x 8" Cube Core Eggcrate Return Air Grille Black + Product Details Size –+ Product Details Size 8" x 18" or 18" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 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