26" x 34" or 34" x 26" Cube Core Eggcrate Return Air Grille w30h30 Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 17 3/4" x 1"

Actual Filter Size – 17 3/4"w x 23 3/4" x 1"

much more than required 700 PSI for R410

Actual Filter Size – 9 3/4"w x 33 3/4" x 1"

actual front end outer dimensions are approximately 24 5/8" width X 38 5/8" height

26" x 34" or 34" x 26" Cube Core Eggcrate Return Air Grille w30h30 Actual Filter Size – 33+ Product Details Size 26" x 34" or 34" x 26" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 27. 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