20" x 28" or 28" x 20" Cube Core Eggcrate Return Air Grille w12h12 accordion dd ul li {

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180 Degrees Double Direction Adjustable - Fins Are Manually Adjustable Individually for Optimal Air Distribution

+ Product Details Heavy-Duty Steel Construction - Made from 20-gauge steel for superior durability and reliable performance

Actual Filter Size – 25 3/4"w x 19 3/4" x 1"

20" x 28" or 28" x 20" Cube Core Eggcrate Return Air Grille w12h12 accordion dd ul li {+ Product Details Size 20" x 28" or 28" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 29. 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