10" x 18" or 18" x 10" Cube Core Eggcrate Return Air Grille w25h25 + Product Details Size –

+ Product Details Size – 30"w X 30"h is the size for the duct opening measurement only

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

Universal Fit – Dimensions of 6-3/8" wide x 3-1/2" high x 3" deep make it compatible with most standard thermostat models

Equipped with a locking eight-tumbler key system

75"H – fits a 18" X 12" duct opening

10" x 18" or 18" x 10" Cube Core Eggcrate Return Air Grille w25h25 + Product Details Size –+ Product Details Size 10" x 18" or 18" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 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