18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille w22h22 + Product Details Outer dimensions:

+ Product Details Outer dimensions: 31

actual front end outer dimensions are approximately 20 5/8" width X 8 5/8" height

display: block

Traditional HVAC systems were designed for cold air

18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille w22h22 + Product Details Outer dimensions:+ Product Details Size 18" x 36" or 36" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 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