20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Grille Round Damper Ring each diffuser is carefully shrink-wrapped

each diffuser is carefully shrink-wrapped with a sturdy cardboard backing

actual front end outer dimensions are approximately 10 5/8" width X 8 5/8" height

Multi-shutter damper with handle operator to adjust air flow

+ Product Details Size – 24" x 24" with 14" collar T-Bar drop ceiling perforated return grill - metal back casing

+ Product Details Size - 24"w X 34"h is the size for the duct opening measurement only

20" x 34" or 34" x 20" Cube Core Eggcrate Return Air Grille Round Damper Ring each diffuser is carefully shrink-wrapped+ 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