12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Grille w6h6 + Product Details Size –

+ Product Details Size – 12" x 12" is the size for the duct opening measurement only

It has an outer surface made of high-quality aluminum foil and an inner surface made of metalized PET with inside high-tensile spring steel wire

Never Rust Plastic 2-Way Vertical Air Supply Register

actual front end outer dimensions are approximately 21

12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Grille w6h6 + Product Details Size –+ Product Details Size 12" x 36" or 36" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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