UNIVERSAL USAGE: Will fit any 120mm or 92mm fan with standard 4" ducting. SECURELY FASTENED: Easily secure the ducting to the shroud with the included stainless steel clamp. ENGINEERED EFFICIENCY: The shroud is engineered to slightly and gradually reduce the size from the fan side to the duct side to minimize airflow blockage. TRUST IN PRODUCTS: We stand by our branded products and back them with a 3 year manufacturer warranty.