24" x 28" or 28" x 24" Cube Core Eggcrate Return Air Grille Material_Aluminum Operating temperature from -40°f to

Operating temperature from -40°f to +248°f [-40°c to +120°c]

Design – removable door/face for easy filter change & cleaning - uses a 1" thick filter

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 25" OR 25" X 14" duct opening (measured at the opening)

+ How To Measure A Round Vent Overall Size:

24" x 28" or 28" x 24" Cube Core Eggcrate Return Air Grille Material_Aluminum Operating temperature from -40°f to+ Product Details Size 24" x 28" or 28" x 24" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 25. 75" X 29. 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