8" x 18" or 18" x 8" Cube Core Eggcrate Return Air Grille 12in diameter + Product Details Size -

+ Product Details Size - 36"w X 10"h is the size for the duct opening measurement only

high-impact plastic to provide reliable and long-lasting protection for your thermostat

actual front end outer dimensions are approximately 16 5/8" width X 32 5/8" height

This aluminum adjustable louvered garage vent allows air ventilation and circulation in your garage 24 hours a day

+ Product Details Size – 20"w X 36"h is the size for the duct opening measurement only

8" x 18" or 18" x 8" Cube Core Eggcrate Return Air Grille 12in diameter + Product Details Size -+ Product Details Size 8" x 18" or 18" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" X 19. 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