6" x 36" or 36" x 6" Cube Core Eggcrate Return Air Grille Supply Grille 75"H – fits a 12"

75"H – fits a 12" X 8" duct opening

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 14" duct opening (measured at the opening)

Choose our premium HVAC grilles and registers for long-lasting durability

Actual Filter Size – 11 3/4"w x 23 3/4" x 1"

Design – Fixed Hinged for easy filter change & cleaning - uses a 1" thick filter

6" x 36" or 36" x 6" Cube Core Eggcrate Return Air Grille Supply Grille 75"H – fits a 12"+ Product Details Size 6" x 36" or 36" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" X 37. 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