20" x 36" or 36" x 20" Cube Core Eggcrate Return Air Grille Powder-Coat it integrates effortlessly into T-bar

it integrates effortlessly into T-bar or plaster frame ceilings

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

our Circular Air Supply Valves are ideal for low and medium pressure ventilation air conditioning systems

actual front end outer dimensions are approximately 27 5/8" width X 38 5/8" height

20" x 36" or 36" x 20" Cube Core Eggcrate Return Air Grille Powder-Coat it integrates effortlessly into T-bar+ Product Details Size 20" x 36" or 36" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 37. 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