22" x 30" or 30" x 22" Cube Core Eggcrate Return Air Grille Insulated Line + Product Details Size -

+ Product Details Size - 20"w X 20"h is the size for the duct opening measurement only

The permanently attached eight-tumbler lock with a supplied key adds an extra layer of security

Design – Heavier gauge than needed

+ Product Details Size – 10" x 30" or 30" x 10" is the size for the duct opening measurement only

22" x 30" or 30" x 22" Cube Core Eggcrate Return Air Grille Insulated Line + Product Details Size -+ Product Details Size 22" x 30" or 30" x 22" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 23. 75" X 31. 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