12" x 22" or 22" x 12" Cube Core Eggcrate Return Air Grille return filter + Product Details Size -

+ Product Details Size - 28"w X 10"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 18"h X 2"d (for duct opening measurement only)

75" Width X 9

Design – Made of strong durable ABS plastic

12" x 22" or 22" x 12" Cube Core Eggcrate Return Air Grille return filter + Product Details Size -+ Product Details Size 12" x 22" or 22" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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