SUIT FOR MOST TURBINE VENTILATOR: The size of the roof ventilator cover is 20" x 20". Please note the size of your turbine ventilator.PROTECTION FUNCTION: After installing the roof ventilation cover. It can protect the turbine from rain, snow, wind and dust. Protects the indoor hygienic environment. Prevents heat loss by lowering indoor temperature.WATERPROOF DUSTPROOF: The roof ventilation cover is made of high quality 420D waterproof oxford cloth. The interior is coated with silver. Good waterproof effect. Prevents dust from entering the room.EASY TO INSTALL: The bottom of the roof vent cover has a drawstring design. Fixed by pulling the drawstring tightly. Prevents the ventilation cover from being blown away by the wind.AFTER SALES SERVICE: Turbine roof vent cover are strictly quality controlled. You will have 3 months free return service. If you have any use and quality problems. I will give you a satisfactory reply within 12 hours.Add to Cart with Confidence