20" x 24" or 24" x 20" Cube Core Eggcrate Return Air Grille Compatible With Duct 8in actual front end outer dimensions

actual front end outer dimensions are approximately 36 5/8" width X 10 5/8" height

75" Width X 37

Actual Filter Size – 33 3/4"w x 5 3/4" x 1"

Design – Removable frame for easy filter change & cleaning - uses a 1" thick filter

20" x 24" or 24" x 20" Cube Core Eggcrate Return Air Grille Compatible With Duct 8in actual front end outer dimensions+ Product Details Size 20" x 24" or 24" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 25. 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