30" x 34" or 34" x 30" Cube Core Eggcrate Return Air Grille Compatible With Duct 6in + Product Details Size –

+ Product Details Size – 20"w X 40"h is the size for the duct opening measurement only

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of up to 300m3/h

actual front end outer dimensions are approximately 22 5/8" width X 20 5/8" height -

+ Product Details Size - 6"w X 6"h X 2"d (for duct opening measurement only)

30" x 34" or 34" x 30" Cube Core Eggcrate Return Air Grille Compatible With Duct 6in + Product Details Size –+ Product Details Size 30" x 34" or 34" x 30" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 32. 5" X 36. 5". 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