20" x 22" or 22" x 20" Cube Core Eggcrate Return Air Grille Filter Grille + Product Details Size -

+ Product Details Size - 8"w X 30"h is the size for the duct opening measurement only

you can watch this informative video tutorial: How to Measure Your Vent Hole Before Ordering a Grille

Pre-flared ends with nuts are for simple and easy installation

Installation Location – Wall or door mount - door thickness up to 32mm - anodised finish - smooth & beautiful

+ Product Details Size - 20"w X 12"h is the size for the duct opening measurement only

20" x 22" or 22" x 20" Cube Core Eggcrate Return Air Grille Filter Grille + Product Details Size -+ Product Details Size 20" x 22" or 22" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 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