18" x 20" or 20" x 18" Cube Core Eggcrate Return Air Grille Color_Red Oak Wood textContent = '+'

textContent = '+'

Actual Filter Size – 29 3/4"w x 33 3/4" x 1"

+ Product Details Size – 16" x 16" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 26 5/8" width X 12 5/8" height

18" x 20" or 20" x 18" Cube Core Eggcrate Return Air Grille Color_Red Oak Wood textContent = '+'+ Product Details Size 18" x 20" or 20" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 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