If the VEVOR Ducting Hose, 25ft PVC Flexible HVAC Duct Hosing for 10 Inch Utility Blower Exhaust Fan is used with the VEVOR Portable Ventilator, 10" Heavy Duty Cylinder Fan, 350W Strong Shop Exhaust Fan 1942CFM, 9.8ft Power Cord, how much is the airflow produced by the fan alone reduced?