18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille w22h22 75"H – fits a 16"

75"H – fits a 16" X 12" duct opening

this guard ensures long-lasting protection and security

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

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18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille w22h22 75"H – fits a 16"+ Product Details Size 18" x 36" or 36" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 37. 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