26" x 30" or 30" x 26" Cube Core Eggcrate Return Air Grille Copper Coil accordion-title:hover { background-color: #f0f0f0

accordion-title:hover { background-color: #f0f0f0

Actual Filter Size – 31 3/4"w x 25 3/4" x 1"

actual front end outer dimensions are approximately 30 5/8" width X 22 5/8" height

Think of the diameter as a straight line from one end to the other

+ Product Details Size - 16"w X 34"h is the size for the duct opening measurement only

26" x 30" or 30" x 26" Cube Core Eggcrate Return Air Grille Copper Coil accordion-title:hover { background-color: #f0f0f0+ Product Details Size 26" x 30" or 30" x 26" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 27. 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