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 roofs within minutes while protecting your space from 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 non-power roof ventilator operates without electricity. It automatically exhausts air throughout the day, providing an energy-saving solution with continuous, silent operation. Avoid additional energy costs and electrical hazards with this reliable ventilation option.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 discharge, helping to prevent moisture buildup and stale air.Ideal for residential or light commercial use, this ventilator is suitable for installations on factories, farms, workshops, kitchens, roofs, and homes. It provides consistent airflow and is especially useful in chimneys or vents that are not frequently used, contributing to a more comfortable indoor environment.Despite requiring no electricity, the ventilator delivers fast air exhaust within minutes. It is designed to reliably protect interiors from rain and excess moisture.Enjoy quiet performance with this non-power roof ventilator. Its seamless operation provides efficient ventilation without generating noise. Made from durable stainless steel, it offers rust-resistant and heat-resistant properties for long-lasting service.Size: Tube diameter: approximately 4.33 inches (11 cm) Turbine diameter: approximately 7.48 inches (19 cm)