20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Grille Filter Grille Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 29 3/4" x 1"

+ Product Details Size - 6"w X 18"h is the size for the duct opening measurement only

High Quality – High-quality aluminum with counter-sunk screw holes (screws included) and no sharp edges

actual front end outer dimensions are approximately 16 5/8" width X 27 5/8" height

20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Grille Filter Grille Actual Filter Size – 33+ Product Details Size 20" x 34" or 34" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 35. 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