18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille Material_Aluminum + Product Details Size -

+ Product Details Size - 4"w X 14"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 32 5/8" width X 16 5/8" height -

this guard ensures long-lasting protection and security

production and finish on all products

+ Product Details Size - 12"w X 14"h is the size for the duct opening measurement only

18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille Material_Aluminum + Product Details Size -+ Product Details Size 18" x 34" or 34" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 35. 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