24" x 26" or 26" x 24" Cube Core Eggcrate Return Air Grille Compatible With Duct 8in actual front end outer dimensions

actual front end outer dimensions are approximately 10 5/8" width X 8 5/8" height

+ Product Details Size – 18"w X 18"h is the size for the duct opening measurement only

Actual Filter Size – 13 3/4"w x 19 3/4" x 1"

actual front end outer dimensions are approximately 30 5/8" width X 26 5/8" height

ensuring compatibility with most thermostat models

24" x 26" or 26" x 24" Cube Core Eggcrate Return Air Grille Compatible With Duct 8in actual front end outer dimensions+ Product Details Size 24" x 26" or 26" x 24" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 25. 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