Our package includes 2 non-power 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 the roof space within minutes while protecting against rain and moisture.The non-power roof ventilator is constructed from high-quality 201 stainless steel, ensuring durability and long-term performance. The material resists rust and withstands high temperatures, making it suitable for various weather conditions.This roof ventilator requires no electricity to operate. It functions automatically by utilizing wind power to exhaust air continuously throughout the day. This energy-saving solution helps reduce energy costs and eliminates concerns about electrical failures, providing silent and reliable operation.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 exchange, helping to prevent moisture buildup and stale air.Ideal for residential or light commercial use, this ventilator is suitable for installation on houses, roofs, kitchens, workshops, factories, farms, and similar structures. It is especially useful in areas where chimneys are not frequently used, contributing to a more comfortable indoor environment.Despite requiring no electricity, the ventilator delivers fast and consistent air exhaust within minutes. Designed for reliability and efficiency, it helps protect your building from rain and excess moisture.Enjoy quiet ventilation with this non-power roof ventilator. Its seamless operation provides effective airflow without generating noise. Made from durable stainless steel, it offers rust-resistant 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)