Value Package Meal: 1 Pack Versatile Roof Ventilator Cover+ 24 hours customer email service+ 100% satisfaction guarantee. Love your turbine roof weather bag or get your money back with no question asked.Durable Wind Turbine Cover: Made of high quality oxford, lightweight, durable, waterproof , dustproof and windproof for life time using.Protective Turbine Roof Cover: A necessary weather turbine protective bag you ever need it for your turbine roof vent. Protects turbines from rain, snow, wind and dust. It also reduces home heat loss.Universal Ventilation Cover Size: diameter x height (S: 12" x 17.5", L: 20 "x20"). Fits 12"or 20" turbines with external support structure.Easy To Install And Take Off Roof Vent Cover: The roof vent cover is easy to use. Heavy duty grommet and tie rope for easy installation and durability.Elastic rope below to increase the stationarity and will not be blown away by wind. Product Description Turbine Vent Cover Turbine Vent Cover A great black roof ventilator cover you ever need it for your turbine roof. 420D Waterproof Material: Window air conditioner cover are made of high quality 420D waterproof oxford cloth, with a silver inner layer, better waterproof effect, washable and durable. Suit for Most Turbine Ventilator: Roof ventilator cover has two sizes, the small size is: 12D x 17.5W inch(30D x 44W cm), large size is: 20D x 20W inch(50D x 50W cm) suit for most of roof cover. Bottom Straps Design:Outside units Air conditioner protection cover has a adjustable straps in the bottom, make the cover not easy being falling due to wind, easy to put on and take off. Dustproof and Waterproof: Black Air Conditioner cover could protect the central ac unit from sun, dust, water, snow protection in winter, protect your turbine ventilator and keep indoor warm in winter. Black Roof Ventilator Cover Specifications Material: 420D waterproof oxford cloth Two Size For Your Option: S: 12D x 17.5W inch(30D x 44W cm) or L: 20D x 20W inch(50D x 50W cm) Color: Black Product Details Heavy Duty Material Double stitched seams , durable for long time using! Drawstring Design Heavy duty frommets and tie-down string allow for easy installation. Protective Heavy duty fabric, protects the turbine from water, rain, snow, wind and dirt. Black Roof Ventilator Cover Waterproof Turbine Roof Cover