Our package includes 2 non-powered roof ventilators, each with a hoop. The vent connection size measures approximately 4.33 inches (11 cm) in diameter and 7.48 inches (19 cm) in height. It ensures quick and efficient release of hot air from roofs while protecting your space from rain and moisture. The non-powered roof ventilator is constructed from premium 201 stainless steel, ensuring durability and strength. The material resists rust and withstands high temperatures, making it ideal for various weather conditions. This non-powered roof ventilator requires no electricity to operate. It automatically exhausts air continuously throughout the day, offering an energy-saving solution without the risk of electrical issues, providing constant and silent performance. The ventilator features a tube diameter of approximately 4.33 inches (11 cm) and a turbine diameter of approximately 7.48 inches (19 cm). Its optimized size allows for rapid and effective air circulation while preventing moisture buildup and stale air. This ventilator is suitable for residential or light commercial use and is ideal for locations such as factories, farms, workshops, kitchens, roofs, and homes. It also works well in chimneys that are not frequently used, helping maintain a comfortable indoor environment. Despite requiring no electricity, the unit delivers fast air exhaust. Reliable and efficient, it protects your building from rain and excess moisture. Enjoy quiet operation with this non-powered roof ventilator, which provides seamless ventilation without generating noise. Made from high-quality stainless steel, it offers rustproof and heat-resistant performance for long-lasting service. Size: Tube diameter: approximately 4.33 inches (11 cm) Turbine diameter: approximately 7.48 inches (19 cm) Height: approximately 7.48 inches (19 cm) Color: Silver Material: Stainless steel Package Contents: 1 set x roof vents for houses Note: Light reflection and different display settings may cause slight variations in color shown in images compared to the actual item. Measurement error allowance is +/- 1-3 cm.