18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille 1-Way + Product Details Size –

+ Product Details Size – 8"w X 16"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 12" X 8" duct openings

Location – ceiling and sidewall

+ Product Details Size - 10"w X 18"h is the size for the duct opening measurement only

Design – Circular air supply valves - designed to be used in low and medium pressure ventilation air conditioning systems

18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille 1-Way + Product Details Size –+ Product Details Size 18" x 34" or 34" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 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