18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Grille Round Damper Ring actual front end outer dimensions

actual front end outer dimensions are approximately 16 5/8" width X 14 5/8" height

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

UPC – 810107141946

Perfect for both residential and commercial use

18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Grille Round Damper Ring actual front end outer dimensions+ 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