12" x 20" or 20" x 12" Cube Core Eggcrate Return Air Grille Filter Grille + Product Details Size –

+ Product Details Size – 30"w X 32"h is the size for the duct opening measurement only

+ Product Details Size – 18"w X 34"h is the size for the duct opening measurement only

Actual Filter Size – 23 3/4"w x 19 3/4" x 1"

+ Why Hvac Premium HVAC Premium has been providing superior quality service for many years

+ Product Details Size – 8" x 8" is the size for the duct opening measurement only

12" x 20" or 20" x 12" Cube Core Eggcrate Return Air Grille Filter Grille + Product Details Size –+ Product Details Size 12" x 20" or 20" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 21. 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