18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Grille Aluminum - Cube Core Pre-flared ends with nuts are

Pre-flared ends with nuts are for simple and easy installation

Actual Filter Size – 24 3/4"w x 9 3/4" x 1"

actual front end outer dimensions are 32" width X 10" height

actual front end outer dimensions are approximately 14 5/8" width X 26 5/8" height

Actual Filter Size – 19 3/4"w x 23 3/4" x 1"

18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Grille Aluminum - Cube Core Pre-flared ends with nuts are+ Product Details Size 18" x 30" or 30" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 31. 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