20" x 22" or 22" x 20" Cube Core Eggcrate Return Air Grille Filter Grille This versatile guard features air

This versatile guard features air circulating ports on all four sides to allow proper airflow

+ Product Details Size - 16"w X 10"h is the size for the duct opening measurement only

Actual Filter Size – 17 3/4"w x 27 3/4" x 1"

+ Product Details Size – 16" x 34" or 34" x 16" is the size for the duct opening measurement only

+ Product Details Size – 36"w X 34"h is the size for the duct opening measurement only

20" x 22" or 22" x 20" Cube Core Eggcrate Return Air Grille Filter Grille This versatile guard features air+ Product Details Size 20" x 22" or 22" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 23. 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