18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Grille Round Damper Ring 75" Width X 23

75" Width X 23

+ Product Details Size - 14"w X 30"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 27 5/8" width X 16 5/8" height

Actual Filter Size – 13 3/4"w x 23 3/4" x 1"

18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Grille Round Damper Ring 75" Width X 23+ Product Details Size 18" x 26" or 26" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 27. 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