1. Dual-Size Compatible Fitted Accessories Advantages of the 12-inch Model: Enhances installation stability and improves user experience. Standard sizes are 9 9 inches and 12 12 inches, with spring clip spacing of 7 inches and 9 inches, suitable for mainstream bathroom fan models such as the K/G/H/J-689-688 series. Users are advised to check the fan model and grille size before purchasing to ensure a smooth replacement. 2. Stepped high-efficiency ventilation 360 Uniform Air Intake: The unique stepped grille design disperses airflow, quickly dissipates moisture and odors, and avoids direct wind and discomfort Anti-condensation construction: ABS plastic material reduces water droplet build-up and ventilation efficiency is up to 30% higher than metal lids 3