Hon&Guan 4/6Inch Inline Duct Fan Booster Exhaust Blower Air Cooling Vent Metal Blades with Speed Controller

Arrived safe and no damaged. Legit seller. Recommendable for your roof ventilation.\n\n 🔋Energy Efficiency:100%\n 🔊Noise Level:Tolerable\n 🌬️Airflow Capacity:Depends on wattage\n \nsee attached photos;

Received well and in good condition. Wind suction is not bad. Using the variable speed controller, noise of airflow will be noticeable if at max speed. Using at half speed while still getting good suction power and airflow noise will be similar to running a fan. Light hissing sound only. Very light and easy to move around to areas needing extra ventilation.