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rust-free aluminum
actual front end outer dimensions are approximately 20 5/8" width X 14 5/8" height
Seamless Installation: Designed to fit seamlessly into a 24 by 24 inch opening
+ Product Details Size - 12"w X 36"h is the size for the duct opening measurement only
+ Product Details Size - 30"w X 30"h is the size for the duct opening measurement only
14" x 28" or 28" x 14" Cube Core Eggcrate Return Air Grille w28h28 rust-free aluminum+ Product Details Size 14" x 28" or 28" x 14" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 16. 5" X 30. 5". 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